An onboard device comprising: a speaker; a microphone; a housing (10,20) that forms a cavity inside, the housing (10,20) internally including the speaker such that a sound emission surface of the speaker faces a direction substantially orthogonal to a front surface, the housing (10,20) having a first opening formed in the front surface; a first microphone case provided on the front surface of the housing (10,20), the microphone being housed inside the first microphone case, the first microphone case having a sound pickup hole in a front surface of the first microphone case; and a sound guide member (62, 63, 64) comprising a second microphone case, a second outer plate, and a second microphone case cover and being juxtaposed with the first microphone case on the front surface of the housing (10,20), the sound guide member having a sound guide hole that passes through the sound guide member, wherein the first opening is provided in a vicinity of a top surface or a bottom surface of the housing (10,20); the first opening has a height smaller than a height of the housing (10,20), 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 side of the sound guide hole is provided to be biased to a side far from the first microphone case, the third opening has a height higher than a height of the first opening, and 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. a speaker; a microphone; a housing (10,20) that forms a cavity inside, the housing (10,20) internally including the speaker such that a sound emission surface of the speaker faces a direction substantially orthogonal to a front surface, the housing (10,20) having a first opening formed in the front surface; a first microphone case provided on the front surface of the housing (10,20), the microphone being housed inside the first microphone case, the first microphone case having a sound pickup hole in a front surface of the first microphone case; and a sound guide member (62, 63, 64) comprising a second microphone case, a second outer plate, and a second microphone case cover and being juxtaposed with the first microphone case on the front surface of the housing (10,20), the sound guide member having a sound guide hole that passes through the sound guide member, wherein the first opening is provided in a vicinity of a top surface or a bottom surface of the housing (10,20); the first opening has a height smaller than a height of the housing (10,20), 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 side of the sound guide hole is provided to be biased to a side far from the first microphone case, the third opening has a height higher than a height of the first opening, and 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.