VALVE SYSTEM DEVICE OF INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To improve efficiently of mounting work of a holder provided with a holding part to hold an energizing member to an engine main body on a valve system device of an internal combustion engine. SOLUTION: This valve system device of an internal combustion engine is furnished with energizing members 33, 34, etc., to energize locker arms 19, etc., interlocking with an engine valve composed of a suction valve and an exhaust valve by springing force and a holder 50 provided with holding parts 53, 54, etc., to hold the energizing members 33, 34, etc. Through-holes 53a, etc., passing through the holder 50 toward the locker arms 19, etc., are provided on the holding parts 53, 54, etc., are energizing members 33, 34, etc., can be installed on the holding parts after the holder 50 is installed on an opening end part of the cylinder head 1 oscillatably supporting the locker arms 19, etc.