Cylinder head of engine

A cylinder head of an engine, comprising:

• a first intake port and a second intake port, each having an opening that opens to a common cylinder,
• wherein the first intake port opens to the cylinder to generate a swirl flow in which intake air circles in the cylinder around a cylinder axis,
• wherein the second intake port has a tumble flow generating part configured to cause intake air to form a tumble flow in the same direction as the swirl flow and flow into the cylinder, the tumble flow generating part including a helical part having an inner wall surface curving around a centerline perpendicular to an opening surface of the second intake port and continuing from a first intake port side to an opposite side from the first intake port at the opening of the second intake port, and
• wherein the second intake port has an edge part of the opening thereof, the edge part having an opening angle with respect to the centerline of the second intake port, the opening angle being smaller at an upstream side of the swirl flow than at a downstream side of the swirl flow.