A high frequency module includes a ground mounting electrode connected to a ground terminal of a component, a first ground in-plane conductor in a multilayer substrate on a portion under the component and connected to the ground mounting electrode with a first ground interlayer connecting conductor, a signal mounting electrode connected to a signal terminal of the component, and a signal in-plane conductor provided in the multilayer substrate on a portion under the first ground in-plane conductor and connected to the specific signal mounting electrode with a signal interlayer connecting conductor. The first ground in-plane conductor is between the component and the signal in-plane conductor, and the signal interlayer connecting conductor is on an outer side portion of the first ground in-plane conductor when seen from above.