A camera including a camera body having a substantially flat shape, a photographing optical system configured to perform a photographing operation and accommodated in the camera body, the photographing optical system having a photographing optical axis in a direction perpendicular to a thickness direction of the camera body and a photographing object side plane, the photographing object side plane facing an object to be photographed when photographing, and a release button configured to activate the photographing operation of the photographing optical system provided on a side surface of the camera body corresponding with the photographing object side plane of the photographing optical system.