To provide a film unit having a lens capable of shortening charging time, built-in with a small and inexpensive stroboscope device.

A stroboscope device is composed of a circuit board 44 on which a stroboscope circuit is arranged, stroboscope light emitting parts 11a to 11b installed on this circuit board 44 and an exclusive dry battery 52 being a power source of this stroboscope device. In the exclusive dry battery 52, for example, a length is set to 50.5 mm in the same as mono 3 type dry batteries R6 and L6, and a diameter is set to 10.5 mm in the same as mono 4 type dry batteries R03 and LR03. This exclusive dry battery 52 is formed by laminating plural unit cells inside, and voltage between both electrodes is higher than 1.5 volt, and is set to, for example, about 3 volt.