A cylinder head for an engine, comprising: a first intake port and a second intake port, each having an opening (15, 16) 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, the first intake port is a tangential port formed so that intake air flows from the opening into the cylinder substantially in a tangential direction of an inner circumferential surface of the cylinder, wherein the second intake port has a tumble flow generating part configured to cause intake air to form a tumble flow substantially 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 substantially around a centerline substantially 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, characterized in that 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, the cylinder head comprises at least one common port that opens to a side surface of the cylinder head, the first intake port and the second intake port branch into two ways from the common port and extend toward the cylinder, the second intake port includes a curved part, provided upstream of the helical part, curved to be convex in a direction away from the first intake port so that intake air is guided to flow toward the inner wall surface of the helical part on the first intake port side, and the second intake port is provided with a guide surface located at the upstream side of the swirl flow S within the edge of the opening, and a guide surface located at the downstream side of the swirl flow S, wherein an opening angle of the guide surface on the upstream side of the swirl flow S is smaller than the opening angle of the guide surface on the opposite side across the opening. a first intake port and a second intake port, each having an opening (15, 16) 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, the first intake port is a tangential port formed so that intake air flows from the opening into the cylinder substantially in a tangential direction of an inner circumferential surface of the cylinder, wherein the second intake port has a tumble flow generating part configured to cause intake air to form a tumble flow substantially 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 substantially around a centerline substantially 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, characterized in that 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, the cylinder head comprises at least one common port that opens to a side surface of the cylinder head, the first intake port and the second intake port branch into two ways from the common port and extend toward the cylinder, the second intake port includes a curved part, provided upstream of the helical part, curved to be convex in a direction away from the first intake port so that intake air is guided to flow toward the inner wall surface of the helical part on the first intake port side, and the second intake port is provided with a guide surface located at the upstream side of the swirl flow S within the edge of the opening, and a guide surface located at the downstream side of the swirl flow S, wherein an opening angle of the guide surface on the upstream side of the swirl flow S is smaller than the opening angle of the guide surface on the opposite side across the opening.