Abstract: A portable small-sized camera has a case having a ball-point pen appearance in a portion thereof and a through hole in one side, and a camera circuit part built in the case and for photographing an object through the through hole. The portable small-sized camera has the ball-point pen appearance, photographing a particular location in secret is possible without exposure to others. The camera circuit part is connected to a wireless transmission device for outputting a signal by a cable. A wireless receiving device at a remote location from the wireless transmission device receives a signal of the wireless transmission device for outputting or recording.