A laminated half-wave plate includes: first and second wave plates having optical axes intersecting each other, wherein when phase differences of the first and second wave plates with respect to a wavelength λ are represented by Γ1 and Γ2, in-plane bearing angles formed by a polarization plane of a linearly-polarized beam incident on the laminated half-wave plate and the optical axes of the first and second wave plates are represented by θ1 and θ2, an angle formed by the polarization directions of the linearly-polarized beams incident on and emitted from the laminated half-wave plate is represented by φ, and an optical axis adjustment amount is represented by a, the following expressions are satisfied: Γ1=180°+n×360°; Γ2=180°+n×360° (where n in Γ1 and Γ2 is a non-negative integer); θ1=φ/4+a; and θ2=3φ/4−a.