An antenna module includes a dielectric substrate, a radiating element, a ground electrode, a feed line, a via connected to the radiating element, and an auxiliary electrode The ground electrode and faces the radiating element across the dielectric substrate. The feed line transmits a radio-frequency signal to a feed point of the radiating element, wherein the feed point is offset from the center of the radiating element in a first direction. The auxiliary electrode is connected to the via and is disposed between the radiating element and the ground electrode. The via is connected to the radiating element at a position offset from the center of the radiating element in a second direction opposite to the first direction. When viewed in plan from a normal direction of the dielectric substrate, the auxiliary electrode protrudes from the radiating element toward the second direction.