To provide portable equipment with a power generation apparatus which generates power with higher efficiency.

A power generation device includes a power generating means to induce electricity, a rectifying means to rectify the electricity induced by the power generating means, and an accumulating means of the electricity rectified by the rectifying means. The power generating means includes a bias magnet which is magnetized in two poles, a magnetostriction material, a compressing means, a closed magnetic path forming member, and a coil. The magnetostriction material changes magnetic permeability through a reverse magnetostrictive effect by applying force from an outside, and changes a flow of magnetic flux which is generated at one pole of the bias magnet. The compressing means is arranged between the bias magnet and the magnetostriction material, and applies periodic amplitude force to the magnetostriction material. The closed magnetic path forming member is arranged so that the magnetic flux flowing out of the magnetostriction material may be introduced to the other pole of the bias magnet. The coil is wound around the magnetostriction material or the closed magnetic path forming member. Such constitution is employed to supply the electricity induced by the power generating means to the rectifying means through a coil terminal of the coil.