An antenna substrate includes a plate-shaped dielectric with a main surface and a side surface, a plate-shaped radiating element arranged in parallel to the main surface of the plate-shaped dielectric, and a first terminal exposed at least partially at the side surface of the dielectric, wherein with a direction along a normal to the radiating element being defined as a first direction and with two directions orthogonal to the first direction and orthogonal to each other being defined as a second direction and a third direction, the first terminal includes a portion that does not overlap with the radiating element when viewed from the first direction and overlaps with the radiating element when viewed from both of the second direction and the third direction.