diff --git a/rest/getGyazoToken.ts b/rest/getGyazoToken.ts
new file mode 100644
index 0000000..7489c2f
--- /dev/null
+++ b/rest/getGyazoToken.ts
@@ -0,0 +1,53 @@
+import type { NotLoggedInError } from "../deps/scrapbox.ts";
+import { cookie } from "./auth.ts";
+import { UnexpectedResponseError } from "./error.ts";
+import { tryToErrorLike } from "../is.ts";
+import { BaseOptions, Result, setDefaults } from "./util.ts";
+
+export interface GetGyazoTokenOptions extends BaseOptions {
+  /** Gyazo Teamsのチーム名
+   *
+   * Gyazo Teamsでuploadしたいときに使う
+   */
+  gyazoTeamsName?: string;
+}
+
+/** Gyazo OAuth uploadで使うaccess tokenを取得する
+ *
+ * @param init connect.sidなど
+ * @return access token
+ */
+export const getGyazoToken = async (
+  init?: GetGyazoTokenOptions,
+): Promise<
+  Result<
+    string | undefined,
+    NotLoggedInError
+  >
+> => {
+  const { sid, hostName, gyazoTeamsName } = setDefaults(init ?? {});
+  const path = `https://${hostName}/api/login/gyazo/oauth-upload/token${
+    gyazoTeamsName ? `?gyazoTeamsName=${gyazoTeamsName}` : ""
+  }`;
+
+  const res = await fetch(
+    path,
+    sid ? { headers: { Cookie: cookie(sid) } } : undefined,
+  );
+
+  if (!res.ok) {
+    const text = await res.text();
+    const value = tryToErrorLike(text);
+    if (!value) {
+      throw new UnexpectedResponseError({
+        path: new URL(path),
+        ...res,
+        body: await res.text(),
+      });
+    }
+    return { ok: false, value: value as NotLoggedInError };
+  }
+
+  const { token } = (await res.json()) as { token?: string };
+  return { ok: true, value: token };
+};
diff --git a/rest/mod.ts b/rest/mod.ts
index c78102f..88723d0 100644
--- a/rest/mod.ts
+++ b/rest/mod.ts
@@ -7,6 +7,7 @@ export * from "./link.ts";
 export * from "./search.ts";
 export * from "./getWebPageTitle.ts";
 export * from "./getTweetInfo.ts";
+export * from "./getGyazoToken.ts";
 export * from "./auth.ts";
 export * from "./util.ts";
 export * from "./error.ts";