A blower fan includes a heat source contact portion. A side wall portion includes a tongue portion. In a plan view, The heat source contact portion is arranged to cover a portion of a region surrounded by a third imaginary straight line tangent to an outer circumferential surface of a blade support portion and extending in parallel with the second imaginary straight line toward the air outlet in the first region, a fourth imaginary straight line tangent to the outer circumferential surface of the blade support portion and extending in parallel with the first imaginary straight line in the third region, the outer circumferential surface of the blade support portion, and the air outlet.