A small-sized piezoelectric power generation device is provided which can generate electric power even with vibrations at low frequencies. The piezoelectric power generation device includes a piezoelectric element formed in a spiral shape and having a center-side end fixed to a first fixing member and an outer-side end fixed to a second fixing member. The piezoelectric element includes a first piezoelectric body formed in a spiral shape and polarized in a radial direction of the piezoelectric element from one side toward the other side. The first and second fixing members are arranged such that the second fixing member is displaceable relative to the first fixing member in a tangential direction x, whereas the second fixing member is restricted from displacing relative to the first fixing member in a perpendicular direction y.