A slide bearing having a cylindrical shape, comprising an upper semi-cylindrical bearing and a lower semi-cylindrical bearing , the slide bearing rotatably supporting a shaft member , wherein the upper semi-cylindrical bearing comprises: an upper crush relief (11, 111; 12, 112) formed at an upstream end and an upper crush relief formed at a downstream end in the rotation direction of the shaft member in an inner periphery of the upper semi-cylindrical bearing , and an upper oil groove formed in the inner periphery of the upper semi-cylindrical bearing so as to communicate from the upper crush relief formed at the upstream end to the upper crush relief formed at the downstream end, the lower semi-cylindrical bearing comprises: a lower crush relief (21, 121; 22, 122) formed at an upstream end and a lower crush relief formed at a downstream end in the rotation direction of the shaft member in an inner periphery of the lower semi-cylindrical bearing , and a lower oil groove formed in the inner periphery of the lower semi-cylindrical bearing so as to communicate from the lower crush relief formed at the upstream end to the lower crush relief formed at the downstream end, characterised in that each of the upper oil groove and the lower oil groove is formed to have a constant depth along its entire length except for the downstream end of the lower oil groove which has a smaller cross-sectional area than that of a middle portion of the lower oil groove in form of a reduced depth or a reduced longitudinal width. an upper crush relief (11, 111; 12, 112) formed at an upstream end and an upper crush relief formed at a downstream end in the rotation direction of the shaft member in an inner periphery of the upper semi-cylindrical bearing , and an upper oil groove formed in the inner periphery of the upper semi-cylindrical bearing so as to communicate from the upper crush relief formed at the upstream end to the upper crush relief formed at the downstream end, the lower semi-cylindrical bearing comprises: a lower crush relief (21, 121; 22, 122) formed at an upstream end and a lower crush relief formed at a downstream end in the rotation direction of the shaft member in an inner periphery of the lower semi-cylindrical bearing , and a lower oil groove formed in the inner periphery of the lower semi-cylindrical bearing so as to communicate from the lower crush relief formed at the upstream end to the lower crush relief formed at the downstream end, characterised in that each of the upper oil groove and the lower oil groove is formed to have a constant depth along its entire length except for the downstream end of the lower oil groove which has a smaller cross-sectional area than that of a middle portion of the lower oil groove in form of a reduced depth or a reduced longitudinal width. a lower crush relief (21, 121; 22, 122) formed at an upstream end and a lower crush relief formed at a downstream end in the rotation direction of the shaft member in an inner periphery of the lower semi-cylindrical bearing , and a lower oil groove formed in the inner periphery of the lower semi-cylindrical bearing so as to communicate from the lower crush relief formed at the upstream end to the lower crush relief formed at the downstream end, characterised in that each of the upper oil groove and the lower oil groove is formed to have a constant depth along its entire length except for the downstream end of the lower oil groove which has a smaller cross-sectional area than that of a middle portion of the lower oil groove in form of a reduced depth or a reduced longitudinal width. <EOS>