An engine comprising: a cylinder; a cylinder head including at least one first and second port (222,223), the cylinder head being disposed above the cylinder; a camshaft provided in the cylinder head; a valve actuating mechanism provided in the cylinder head; at least one first valve (41,43) including a first valve end to be pressed by the valve actuating mechanism, the first valve (41,43) is configured to open and close the first port (222,223); at least one second valve (42,44) including a second valve end to be pressed by the valve actuating mechanism, the second valve (42,44) being disposed in alignment with the first valve (41,43) in a direction of an axis of the camshaft, the second valve (42,44) is configured to open and close the second port (222,223); and a breather plate disposed above the valve actuating mechanism, wherein an axis of the cylinder slants at an angle closer to vertical than to horizontal, the cylinder head includes a first support wall disposed closer to the first valve (41,43) than to the second valve (42,44), the first support wall supporting the valve actuating mechanism, a second support wall disposed away from the first support wall in the direction of the axis of the camshaft, the second support wall supporting the valve actuating mechanism, and a ceiling wall disposed above the breather plate, the valve actuating mechanism includes a rocker shaft (53,58) supported by the first support wall and the second support wall, and a rocker arm (54,59) supported by the rocker shaft (53,58), the rocker arm (54,59) making contact with the first valve end, the breather plate together with the ceiling wall forms a breather compartment therebetween, the breather plate overlaps the valve actuating mechanism as seen from a direction of the axis of the cylinder, the breather plate includes a bulged portion protruding downward, the bulged portion is located upward of the first valve end, the bulged portion extending in an up-and-down direction, and a lower end of the bulged portion is closer to the first valve end than an upper end of the bulged portion. a cylinder; a cylinder head including at least one first and second port (222,223), the cylinder head being disposed above the cylinder; a camshaft provided in the cylinder head; a valve actuating mechanism provided in the cylinder head; at least one first valve (41,43) including a first valve end to be pressed by the valve actuating mechanism, the first valve (41,43) is configured to open and close the first port (222,223); at least one second valve (42,44) including a second valve end to be pressed by the valve actuating mechanism, the second valve (42,44) being disposed in alignment with the first valve (41,43) in a direction of an axis of the camshaft, the second valve (42,44) is configured to open and close the second port (222,223); and a breather plate disposed above the valve actuating mechanism, wherein an axis of the cylinder slants at an angle closer to vertical than to horizontal, the cylinder head includes a first support wall disposed closer to the first valve (41,43) than to the second valve (42,44), the first support wall supporting the valve actuating mechanism, a second support wall disposed away from the first support wall in the direction of the axis of the camshaft, the second support wall supporting the valve actuating mechanism, and a ceiling wall disposed above the breather plate, the valve actuating mechanism includes a rocker shaft (53,58) supported by the first support wall and the second support wall, and a rocker arm (54,59) supported by the rocker shaft (53,58), the rocker arm (54,59) making contact with the first valve end, the breather plate together with the ceiling wall forms a breather compartment therebetween, the breather plate overlaps the valve actuating mechanism as seen from a direction of the axis of the cylinder, the breather plate includes a bulged portion protruding downward, the bulged portion is located upward of the first valve end, the bulged portion extending in an up-and-down direction, and a lower end of the bulged portion is closer to the first valve end than an upper end of the bulged portion.