In a wiper arm, a head cover detachably attached to an arm head has a stopper wall that protrudes inward from an end thereof and is inserted into a gap between the arm head and an arm member. In the case of forming a wiring by using an ink-jet method, a dot spreads on a wiring formation surface, and it is difficult to narrow width of a wiring. The electronic device determines n least significant bits of the count of the counter from the logic states of the first set of m phase shifted clock signals.