The electronic device can be used with a power source module attached to a device main body. The device main body and the power source module are electrically connected to each other by the respective connector portions. The device main body includes a connection terminal portion with a concave shape, and the power source module has a connection terminal portion with a convex shape that is fit to the connection terminal portion of the device main body. A power source terminal group is provided in a first surface, and a ground terminal group and a communication terminal group for communication with the device main body are provided in a second surface on a side opposite to the first surface, from among connection surfaces of the connection terminal portion. The ground terminal group is arranged at a position closer to the power source terminal group than to the communication terminal group.