VEHICLE-MOUNTED DEVICE

A small-sized onboard device that includes a speaker and a microphone and is configured to reduce noise caused by an echo is provided. The speaker is provided inside a housing that forms a cavity inside so that a sound emission surface of the speaker faces a direction substantially orthogonal to a front surface, and a first opening is formed in a front surface of the housing. A microphone case and a sound guide member are juxtaposed on the front surface of the housing. A microphone is housed inside the microphone case. The microphone case has a sound pickup hole in a front surface of the microphone case. The sound guide member has a sound guide hole that passes through the sound guide member. The first opening is provided in a vicinity of a top surface or a bottom surface of the housing. The first opening has a height smaller than a height of the housing. As viewed from the front surface, a position and a size of a second opening on the first opening side of the sound guide hole substantially matches a position and a size of the first opening. A third opening on a front surface side of the sound guide hole is provided to be biased to a side away from the microphone case. The third opening has a height higher than a height of the first opening. At least a part of an inner wall of the sound guide hole is configured by combining a plurality of inclined surfaces having different directions.