Electroless ni-p plating film for sliding member and manufacturing method therefor

An electroless Ni—P plating film for sliding members, comprising

• a minute irregularity shape on a surface, the minute irregularity shape having a maximum height (Sz) of 0.5 μm or more, a core-part spatial volume (Vvc) of 2000 μm3 or more, a reduced-valley-part spatial volume (Vvv) of 300 μm3 or more, a root mean square slope (Sdq) of 40 μm/mm or more, and an arithmetic mean peak curvature (Spc) of 300 mm−1 or more, wherein
• when an oil component is applied on a surface of the electroless Ni—P plating film, the minute irregularities enhance retention of an oil film formed of the oil component, when the electroless Ni—P plating film is applied only on a surface of one sliding member, and a plating film as a solid lubricating component is applied on a surface of the other sliding member, the minute irregularities enhance transferability of the solid lubricating component to the surface of the electroless Ni—P plating film, and
• the electroless Ni—P plating film has a Vickers hardness of 600 HV or more.