An electronic device housing device includes a housing, a plurality of slots that are arranged side by side inside the housing, the slots each housing the electronic device, a gas passage that guides a gas flowing into each of the slots in a direction across the slots, a connection substrate provided inside the housing to extend upright, the connection substrate being arranged to face the slots, the connection substrate including a connected portion to which a connecting portion of the electronic device housed in each of the slots is to be connected, a ventilation port provided at an end portion of the connection substrate, the ventilation port allowing the gas to flow into through the gas passage from each of the slots, and a fan that sucks the gas flowing into each of the slots into the ventilation port through the gas passage.