A cam cap for an internal combustion engine, having an intake side cam cap portion for an intake camshaft and an exhaust side cam cap portion for an exhaust camshaft, which are integrally formed, comprising: two connection portions (16, 18) that are formed at the intake side cam cap portion and the exhaust side cam cap portion, respectively, so as to protrude from the side of the cam cap opposite from where the camshaft support faces (4a, 6a) of the intake and exhaust side cam cap portions (4, 6) are formed, the connection portions (16, 18) having oil passage connection faces (16a, 18a) that are connected to corresponding oil passage connection faces of a cylinder head cover at which the openings of oil passages (22a, 42a, 42b) leading to ports of oil control valves are formed, respectively, so that oil passages (24, 26, 28, 30, 32, 34) in the exhaust and intake side cam cap portions (4, 6) are connected to the respective oil passages (22a, 42a, 42b) in the cylinder head cover; a wall portion that extends between the connection portion of the intake side cam cap portion and the connection portion of the exhaust side cam cap portion, wherein the upper edge portion of the wall portion extends straight and is cylindrical, having a diameter larger than the thickness of the wall portion measured below the upper edge portion and extending between the connection portion of the intake side cam cap portion and the connection portion of the exhaust side cam cap portion, and in the upper edge portion, the hydraulic oil distribution passage extends straight between the hydraulic oil supply passage in the connection portion of the intake side cam cap portion and the hydraulic oil supply passage in the connection portion of the exhaust side cam cap portion, such that the entire part of the hydraulic oil distribution passage is located higher than the camshaft support faces (4a, 6a) of the exhaust and intake side cam cap portions (4, 6); and a hydraulic oil distribution passage that is formed in the wall portion and through which a hydraulic oil supply passage formed in the connection portion of the intake side cam cap portion and a hydraulic oil supply passage formed in the connection portion of the exhaust side cam cap portion communicate with each other; a hydraulic oil inlet passage that communicates with the hydraulic oil distribution passage and via which hydraulic oil is externally supplied into the hydraulic oil distribution passage. two connection portions (16, 18) that are formed at the intake side cam cap portion and the exhaust side cam cap portion, respectively, so as to protrude from the side of the cam cap opposite from where the camshaft support faces (4a, 6a) of the intake and exhaust side cam cap portions (4, 6) are formed, the connection portions (16, 18) having oil passage connection faces (16a, 18a) that are connected to corresponding oil passage connection faces of a cylinder head cover at which the openings of oil passages (22a, 42a, 42b) leading to ports of oil control valves are formed, respectively, so that oil passages (24, 26, 28, 30, 32, 34) in the exhaust and intake side cam cap portions (4, 6) are connected to the respective oil passages (22a, 42a, 42b) in the cylinder head cover; a wall portion that extends between the connection portion of the intake side cam cap portion and the connection portion of the exhaust side cam cap portion, wherein the upper edge portion of the wall portion extends straight and is cylindrical, having a diameter larger than the thickness of the wall portion measured below the upper edge portion and extending between the connection portion of the intake side cam cap portion and the connection portion of the exhaust side cam cap portion, and in the upper edge portion, the hydraulic oil distribution passage extends straight between the hydraulic oil supply passage in the connection portion of the intake side cam cap portion and the hydraulic oil supply passage in the connection portion of the exhaust side cam cap portion, such that the entire part of the hydraulic oil distribution passage is located higher than the camshaft support faces (4a, 6a) of the exhaust and intake side cam cap portions (4, 6); and a hydraulic oil distribution passage that is formed in the wall portion and through which a hydraulic oil supply passage formed in the connection portion of the intake side cam cap portion and a hydraulic oil supply passage formed in the connection portion of the exhaust side cam cap portion communicate with each other; a hydraulic oil inlet passage that communicates with the hydraulic oil distribution passage and via which hydraulic oil is externally supplied into the hydraulic oil distribution passage.