diff --git a/docs/schedule.md b/docs/schedule.md
index ff96465..c7756bc 100644
--- a/docs/schedule.md
+++ b/docs/schedule.md
@@ -5,6 +5,7 @@
 - [addEvent](#addevent)
 - [updateEvent](#updateevent)
 - [deleteEvent](#deleteevent)
+- [searchAvailableTimes](#searchavailabletimes)
 
 ## Overview
 
@@ -198,3 +199,32 @@ See the example response in the `Reference`.
 #### Reference
 
 - https://developer.cybozu.io/hc/ja/articles/360000393866
+
+### searchAvailableTimes
+
+Search available times of users, organizations and facilities.
+
+#### Parameters
+
+| Name                    |       Type       |          Required           | Description                                                                                |
+| ----------------------- | :--------------: | :-------------------------: | ------------------------------------------------------------------------------------------ |
+| timeRanges              | Array\<Object\>  |             Yes             | The list of search time ranges.                                                            |
+| timeRanges[].start      |      String      |             Yes             | The start datetime of the time range. The format is RFC3339. (e.g. `2020-01-01T00:00:00Z`) |
+| timeRanges[].end        |      String      |             Yes             | The end datetime of the time range. The format is RFC3339. (e.g. `2020-01-01T00:00:00Z`)   |
+| timeInterval            |      number      |             Yes             | The search time interval.                                                                  |
+| attendees               | Array\<Object\>  | Conditionally<br />Required | The list of attendees. Required if `facilities` is not specified.                          |
+| attendees[].type        |      String      |             Yes             | The attendee type. Possible values are `ORGANIZATION`, `USER`.                             |
+| attendees[].id          | Number or String | Conditionally<br />Required | The ID of the attendee. Required if `attendees[].code` is not specified.                   |
+| attendees[].code        |      String      | Conditionally<br />Required | The code of the attendee. Required if `attendees[].id` is not specified.                   |
+| facilities              | Array\<Object\>  | Conditionally<br />Required | The list of facilities. Required if `attendees` is not specified.                          |
+| facilities[].id         | Number or String | Conditionally<br />Required | The ID of the facility. Required if `facilities[].code` is not specified.                  |
+| facilities[].code       |      String      | Conditionally<br />Required | The code of the facility. Required if `facilities[].id` is not specified.                  |
+| facilitySearchCondition |      String      |                             | The facility search condition. Possible values are `AND`, `OR`.                            |
+
+#### Returns
+
+See the example response in the `Reference`.
+
+#### Reference
+
+- https://developer.cybozu.io/hc/ja/articles/360018417771#step1
diff --git a/src/client/ScheduleClient.ts b/src/client/ScheduleClient.ts
index d765a72..b991c1a 100644
--- a/src/client/ScheduleClient.ts
+++ b/src/client/ScheduleClient.ts
@@ -95,7 +95,7 @@ export class ScheduleClient {
     watchers?: Array<{
       type: "ORGANIZATION" | "USER" | "ROLE";
       id?: string | number;
-      code?: string | number;
+      code?: string;
     }>;
     additionalItems?: {
       item?: {
@@ -147,7 +147,7 @@ export class ScheduleClient {
       watchers?: Array<{
         type: "ORGANIZATION" | "USER" | "ROLE";
         id?: string | number;
-        code?: string | number;
+        code?: string;
       }>;
       additionalItems?: {
         item?: {
@@ -166,4 +166,41 @@ export class ScheduleClient {
     const path = buildPath({ endpointName: `schedule/events/${id}` });
     await this.client.delete(path, {});
   }
+
+  public searchAvailableTimes(params: {
+    timeRanges: Array<{
+      start: string;
+      end: string;
+    }>;
+    timeInterval: number;
+    attendees?: Array<{
+      type: "ORGANIZATION" | "USER";
+      id?: string | number;
+      code?: string;
+    }>;
+    facilities?: Array<{
+      id?: string | number;
+      code?: string;
+    }>;
+    facilitySearchCondition?: "AND" | "OR";
+  }): Promise<{
+    availableTimes: Array<{
+      start: {
+        dateTime: string;
+        timeZone: string;
+      };
+      end: {
+        dateTime: string;
+        timeZone: string;
+      };
+      facility: {
+        id: string;
+        code: string;
+        name: string;
+      };
+    }>;
+  }> {
+    const path = buildPath({ endpointName: "schedule/searchAvailableTimes" });
+    return this.client.post(path, params);
+  }
 }
diff --git a/src/client/__tests__/ScheduleClient.test.ts b/src/client/__tests__/ScheduleClient.test.ts
index 5c2c0b5..1c50e3f 100644
--- a/src/client/__tests__/ScheduleClient.test.ts
+++ b/src/client/__tests__/ScheduleClient.test.ts
@@ -246,4 +246,42 @@ describe("ScheduleClient", () => {
       expect(mockClient.getLogs()[0].params).toEqual({});
     });
   });
+
+  describe("searchAvailableTimes", () => {
+    const params = {
+      timeRanges: [
+        {
+          start: "2020-07-01T14:00:00+09:00",
+          end: "2020-07-01T15:00:00+09:00",
+        },
+      ],
+      timeInterval: 30,
+      attendees: [
+        {
+          type: "USER" as const,
+          id: 6,
+        },
+      ],
+      facilities: [
+        {
+          id: 1,
+        },
+      ],
+      facilitySearchCondition: "OR" as const,
+    };
+    beforeEach(async () => {
+      await scheduleClient.searchAvailableTimes(params);
+    });
+    it("should pass the path to the http client", () => {
+      expect(mockClient.getLogs()[0].path).toBe(
+        "/api/v1/schedule/searchAvailableTimes"
+      );
+    });
+    it("should send a post request", () => {
+      expect(mockClient.getLogs()[0].method).toBe("post");
+    });
+    it("should pass params as a param to the http client", () => {
+      expect(mockClient.getLogs()[0].params).toEqual(params);
+    });
+  });
 });