A high-frequency module includes a lower base member having a recess part formed in an upper face thereof, and having a base metal part formed on a lower face thereof that is to be grounded, an upper substrate disposed inside the recess part of the lower base member, a semiconductor device mounted on an upper face of the upper substrate, a first ground line connected to the semiconductor device and formed on the upper substrate, and a ground metal part connected to the base metal part and disposed in the lower base member, wherein the ground metal part is connected to the first ground line on the upper substrate.