A camera is provided in which the body is downsized as far as possible and which enables the incorporation of a large capacity power supply battery to be accomplished efficiently and compactly. A space portion in the camera body which is surrounded by a cartridge chamber, a film take-up spool chamber and a photographing optical path chamber between a photo-taking lens and an aperture portion is used as a power supply battery chamber. A power supply battery substantially equal to the lengthwise direction of a photographing image field is contained in the power supply battery chamber. Capacitors for the light emission of an electronic flash device are disposed in the containing space of the spool chamber in the camera body which is opposite to the cartridge chamber, along a side portion of the spool chamber. Further, a partition wall partitioning the power supply battery chamber and the photographing optical path chamber is bulged to a location which faces the photographing optical path chamber but does not interfere with the photographing optical path to a film surface. Also, a film rewinding gear train is disposed in a space formed at one side of the power supply battery chamber in the direction of thickness of the camera body, along the lengthwise direction of the power supply battery.