A connecting rod bearing for internal combustion engines of a forced-feed lubrication type crank shaft is provided, consisting semicircular bearings. An inner surface of the semicircular bearings is provided with a circumferential groove formed on the inner surface within a maximum circumferential angle range of 45 degrees, measured from one circumferential end facing the same direction as a rotational direction of the crankpin toward a circumferential center region of the semicircular bearing, each of the semicircular bearings having two circumferential ends which are of butt ends brought into contact with those of a mating semicircular bearing. In an assembled state, an axial groove is formed on an inner surface of the semicircular bearings so as to extend along the butt end throughout a full length between both axial ends of the semicircular bearing, whereby the axial groove, as a lubricant-oil flow channel, is connected with the circumferential groove.