An information processing apparatus includes a housing that a slot where an electronic assembly is inserted and extracted and a power supply unit. A first air inlet is present in a corner in a front portion of the electronic assembly and includes a space to store an engaging mechanism that engages with the slot. A duct is arranged between the slot and the housing and includes a second air inlet in a front portion of the housing. A fan is arranged between the slot and the power supply unit. The first inlet communicates with the duct and, by the fan, air from the first air inlet and the second air inlet is sent to the power supply unit through the duct.