A lid lock device includes: a housing configured to be fixed to a vehicle; a lock member configured to be movably assembled in the housing and to lock a lid of the vehicle in a closed state; a driving source configured to be assembled in the housing and to drive the lock member toward a side where the lock is released; a side surface through-hole formed at a position that opposes a side surface of the lock member in the housing; and a protrusion which is formed in a side surface of the lock member, passes through the side surface through-hole to protrude from the housing, and receives a manual operation force for moving the lock member toward the side where the lock is released.