Abstract: This invention is directed to a power supplier for use, for example, in a portable camera which includes a battery housing for accommodating a set of cylindrical batteries in parallel relationship with each other, and a battery door which is connected to the battery housing by means of a hinge so as to open an opening of the housing and to close the opening so as to axially depress the batteries. The batteries are located in the battery housing at two positions, i.e. one position relatively close to the hinge and the other position relatively remote from the hinge.