To provide a lightweight thumbtack driver which can continuously drive thumbtacks into a board or the like by extruding the thumbtack forward from a magazine by a spring and depressing a handle part.

This thumbtack driver comprises a holder which accommodates a magazine capable of being refilled with a string of the thumbtacks, in a freely detachable manner; an extruder with a spring part composed of an extrusion piece fitted to a sliding plate so as to allow the forward extrusion of the thumbtacks one by one; and a forcing device with a forcing rod, for driving the thumbtack into the board or the like, which is attached to the tip part fixed to the holder in a freely opening way.