The present invention involves a hydrogenated copolymer obtained by hydrogenating a copolymer having a softening point falling in a range of 45 to 55.degree. C. determined by a ball & ring method, wherein the hydrogenated copolymer has a softening point of 85 to 95.degree. C. determined by the ball & ring method, and a hot melt adhesive composition comprising this copolymer hydrogenated product. The hydrogenated copolymer of the present invention has a small weight reduction rate in heating and a good hue after heating. The hot melt adhesive composition comprising the same has excellent fluidity in heating and has a small heating loss and a small change in a hue in heating and has excellent heat stability.