To eliminate the need of a junction block during replacement of a microphone head thereby inhibiting the expansion of the entire shape.

A microphone device includes: a microphone head; a body; an outer grip; and a connect substrate. The microphone head converts sounds into electric signals. The body transmits the electric signals. The outer grip is a component that serves as an outer sheath covering a coupling part between the microphone head and the body, couples the microphone head to the body, and is replaceable according to a mechanism connection structure of the microphone head. The connect substrate is housed in the body, establishes electric continuity between the microphone head and the body, and is replaceable according to an electric connection structure of the microphone head.