A ranging pixel located in a peripheral region of a solid-state image sensor includes a microlens having a center axis that is shifted relative to a center axis of the ranging pixel, a first waveguide, and a second waveguide. The first waveguide is disposed on a side of the center axis of the ranging pixel that is in a direction opposite to a direction (projection shift direction) obtained by projecting a shift direction of the microlens onto a straight line connecting a center of the first waveguide and a center of the second waveguide, and the second waveguide is disposed on another side of the center axis of the ranging pixel that is in a direction identical to the projection shift direction of the microlens. In addition, at least one of the difference between the refractive indices of the core and the clad and the cross-sectional area of the core is greater in the first waveguide than in the second waveguide.