a biaxial actuator for an objective lens of an optical pickup that prevents the occurrence of tangential skew when the objective lens is moved in a focussing direction , and thereby improves optical performance . the actuator includes a lens holder 11 that supports an objective lens 11 a , elastic supporting members 13 a , 13 b , 13 c , 13 d each having one end fixed to the lens holder and the other end fixed to a fixed part 14 . the supporting members support the lens holder movably in a radial direction of a disc - form recording medium d and two directions intersecting orthogonally with this direction . the elastic supporting members are provided such that at least one pair on both sides of the objective lens are lined up in the optical axis direction of the objective lens . the pair of elastic supporting members 13 a , 13 b have the spacing h1 of their fixing places 45 , 46 on the lens holder side so set as to be narrower than the spacing h 2 of their fixing places 47 , 48 provided on the fixed part side . the elastic supporting members have expanding / contracting portions 41 that elastically slightly expand and contract along the direction in which the elastic supporting members extend .