A fixing device adapted for a camera having a threaded hole and for a strap with two opposite ends fixed to the camera is provided. The fixing device includes a main body and a threaded post connected to the main body. The main body is configured to be removably disposed on the strap, and the threaded post is configured to be screwed into the threaded hole of the camera. When the main body is disposed on the strap and the threaded post is screwed into the threaded hole, the fixing device divides the strap into a first section and a second section that respectively form a first area and a second area with the camera.