Multi-layer slide member

A multi-layer slide member comprising:

• a back metal layer mainly composed of a steel plate;
• and
• a porous layer having a metallic porous member and a resin composition filled in the metallic porous member, wherein
• the metallic porous member has granular portions and narrow portions and includes a structure, in which the granular portions are connected with each other through the narrow portion, and
• a part or entirety of the narrow portions have a Bi phase and a Sn—Ni—Cu intermetallic compound phase,
• the narrow portion satisfying following relationships:
• 3X≦x;
• and (i)
• 2≦φ1/φ2≦5 (ii)
• is defined as a neck portion, where X is a curvature of the granular portion, x is a curvature of the narrow portion, φ1 is a diameter of the granular portion, and φ2 is a diameter of the narrow portion,
• the Bi phase and the Sn—Ni—Cu intermetallic compound phase precipitate in 30% to 50% of the entire neck portions, and
• the metallic porous member does not contain Ag.