To provide a ventilation system for a dwelling house capable of sufficiently ventilating even a storage room such as a closet.

This ventilation system for the dwelling house supplies the outdoor air to living rooms 1, 2, 3... of the dwelling house and discharges the air from a hallway 8, a lavatory 5, a toilet 7, a bathroom 6 and the like of the dwelling house to the outside. The living room 2 adjacent to the storage room 4 such as the closet of the dwelling house and the storage room 4 are communicated by a communication port 18, and a forcible air supply opening 12b is applied as an air supply opening 12 of the living room 2 communicated to the storage room 4.