An air blowing cooling mechanism includes a duct, a fan, a first shutter member, a second shutter member, a first drive transmitting portion for transmitting a driving force to the second shutter member, and a second drive transmitting portion for transmitting the driving force from the second shutter member to the first shutter member. The second shutter member is supported by the duct so as to be slidable relative to the duct. The first shutter member is supported by the second shutter member so as to be slidable relative to the second shutter member. The second shutter member includes a slidable portion slidable relative to the first shutter member when said first shutter member slides.