An antenna module that includes dielectric substrates, radiating elements that are of a plate shape and disposed in or on the dielectric substrates, ground electrodes, and a peripheral electrode. The ground electrode is disposed in or on the dielectric substrate to face the radiating element. The ground electrode is disposed in or on the dielectric substrate to face the radiating element and is electrically connected to the ground electrode. The peripheral electrode is disposed in a layer, in the dielectric substrate, between the ground electrode and the radiating element and is electrically connected to the ground electrode. A direction normal to the radiating element is a first direction from the ground electrode toward the radiating element. A direction normal to the radiating element is a second direction different from the first direction. The peripheral electrode extends from the ground electrode in the first direction.