The present invention provides a partially-cylindrical sliding member for a journal bearing which is less likely to cause cracks or the like on the surface of the sliding layer at the start of the bearing device and which is less likely to cause shearing of the sliding layer and the backing metal layer. Provided is a partially-cylindrical sliding member including a sliding layer including fibrousparticles having an average particle size of 5-25 [mu]m dispersed in a synthetic resin at a volume ratio of 10-35% of the sliding layer. The particles having a major axis length >=20 [mu]m are included at a volume ratio of >=10% to total particles. A sliding surface side area is defined from the sliding surface and has a thickness of 25% of a sliding layer thickness, where the fibrous particles having a major axis length of >=20 [mu]m have a dispersion index of 1.1-6. An interface side area is defined from the interface and has a thickness of 25% of the sliding layer thickness, where the dispersion index is 1.1-6. An intermediate area is defined between the both areas, where the dispersion index is 0.1 to less than 1.