An antenna module according to an embodiment of the present disclosure includes a dielectric substrate, a first antenna element, a first radio-frequency element, and a first heat-dissipating component. The first antenna element is provided on the dielectric substrate. The first radio-frequency element supplies electric power to the first antenna element. The first heat-dissipating component directs heat from the first radio-frequency element to the outside. The dielectric substrate, the first radio-frequency element, and the first heat-dissipating component are stacked in this order in the Z-axis direction, which is the direction normal to the dielectric substrate. The first heat-dissipating component includes metal. The first heat-dissipating component has a first width at its first position that differs from a second width at its second position located away from the first position in the Z-axis direction.