In a speaker unit of the present invention, a diaphragm with an aspect ratio exceeding one is provided in an internal space of a frame. The frame has both ends thereof provided with a pair of air holes opening on a rear surface, and a pair of electrode members attached thereto. Each of the electrode members includes a clamping portion to be fixed to an end of the frame, and an elastic arm portion extending from the clamping portion along the frame. The elastic arm portion is opposed to the air hole. A clamping portion rear area and a main body rear area having the air hole opened thereon are formed on the rear surface of the frame. The main body rear area is formed lower than the clamped portion rear area in a direction apart from the elastic arm portion of the electrode member.