Polyurethane foam and polishing pad

A polishing pad made of a polyurethane foam obtained by reacting a blend composition consisting of (A) a polyisocyanate, (B) a polyol, (C) a polyvalent alcohol-based chain extender with a molecular weight of equal to or smaller than 400, and (D) water, and optionally one or more additives,

• wherein in the blend composition, component (A), the polyisocyanate, consists of diphenylmethane diisocyanate (MDI) and the MDI is 45 to 70 parts by weight when a total weight of components (A), (B), and (C) is taken as 100 parts by weight, and
• wherein component (B), the polyol, consists of a first polypropylene glycol having a number average molecular weight of equal to or greater than 2500, having an average number of functional groups of equal to or greater than 3 and having ethylene oxide added to a terminal, or component (B), the polyol, consists of said first polypropylene glycol and a second polypropylene glycol having no ethylene oxide added to a terminal.