Abstract: A sliding member has pore-dense portions in which pores are densely packed on a sliding surface of a main body made of a ceramic.

Abstract: A fishing line guide member is formed in a ring shape, and has a curve surface curved from an inner circumferential side toward an outer circumferential side in a cross-sectional view with respect to a cross-section of the fishing line guide member taken along a cut plane including an axis line of the fishing line guide member. In an inner circumferential side part of the curve surface, R1 is larger than R2, in which R1 denotes a curvature radius of an axial center side part of the curve surface and R2 denotes a curvature radius of an axial end side part of the curve surface.

Abstract: A fishing line guide member is formed in a ring shape, and has a curve surface curved from an inner circumferential side toward an outer circumferential side in a cross-sectional view with respect to a cross-section of the fishing line guide member taken along a cut plane including an axis line of the fishing line guide member. In an inner circumferential side part of the curve surface, R1 is larger than R2, in which R1 denotes a curvature radius of an axial center side part of the curve surface and R2 denotes a curvature radius of an axial end side part of the curve surface.

Abstract: A sliding member having a sliding surface comprising a silicon carbide sintered body having a primary phase comprising mainly silicon carbide, and a subphase having a different composition from the primary phase and containing at least boron, silicon and carbon. The ratio of pores having a roundness of 6 ?m or less and a pore diameter of 10 to 60 ?m with respect to all pores having a pore diameter of 10 ?m or more in the sliding surface is 60% or more. This enables retention of good seal properties even in a long-term continuous use. The subphase in the silicon carbide sintered body is preferably granular crystal phases dotted among a plurality of the primary phases. This provides excellent lubricating liquid holding performance as well as excellent thermal conductivity and excellent thermal shock resistance properties.

Abstract: A sliding member having a sliding surface comprising a silicon carbide sintered body having a primary phase comprising mainly silicon carbide, and a subphase having a different composition from the primary phase and containing at least boron, silicon and carbon. The ratio of pores having a roundness of 6 ?m or less and a pore diameter of 10 to 60 ?m with respect to all pores having a pore diameter of 10 ?m or more in the sliding surface is 60% or more. This enables retention of good seal properties even in a long-term continuous use. The subphase in the silicon carbide sintered body is preferably granular crystal phases dotted among a plurality of the primary phases. This provides excellent lubricating liquid holding performance as well as excellent thermal conductivity and excellent thermal shock resistance properties.