19 accordingly for both battery positions of the pre winding mode and picture taking mode as shown by fig4 and 4 a consequently the circuit and film driving mechanism by the motor 16 of the single use camera 1 of the present invention is so designed as to get the motor 16 to rotate to drive the film 18 in the pre winding direction when the battery 22 is placed in the position of the pre winding or to get the motor 16 to rotate to drive the film 18 in the picture taking direction namely in the direction of the film running back into the film cartridge 12 when the battery 22 is placed in the position of the picture taking one of the battery contacts in the battery chamber 19 is an ordinary metal plate spring contact 23 as shown in fig4 a the other one has a recessed area 24 a concave area like a hole where the two different metal contacts 25 and 26 are fixed as shown also in fig4 b a metal contact a 25 which is a metal plate type is provided behind the recessed area 24 and another metal contact b 26 which is a metal boss type is provided at the front rim of the recessed area 24 as shown by fig4 b only the plus pole of the battery 22 can contact with the metal contact a 25 provided behind the recessed area 24 when the battery 22 is placed in the position of the picture taking mode according to the picture taking polarity marks 20 b indicated in the battery chamber 19 as shown by fig4 a fig5 b and fig5 b on the contrary with the metal contact b 26 provided at.