To restrain abrasion of cam lobes 13a and 14a, and to reduce a friction loss, when starting an internal combustion engine, in an oil feeding structure having a carrying passage 36 for supplying lubricating oil to the suction and exhaust camshaft 13, 14 side.

The carrying passage 36 is arranged above camshafts 13 and 14 in a space in cylinder head covers 3L and 3R on the downstream side of oil feeding passages 33L and 33R sending the lubricating oil in a lubricating oil storage part 4 of the internal combustion engine to the cylinder head 2L, 2R side. Delivery ports 41a and 42a of the lubricating oil are arranged in a plurality of places in the carrying direction of this carrying passage 36. The delivery ports 41a and 42a are put in an installation state such as spraying the lubricating oil on the cam lobe 13a, 14a side equipped in the camshafts 13 and 14 by delivering the lubricating oil upward in the vertical direction.