Resin composition, prepreg and resin sheet and metal foil-clad laminate

A resin composition comprising:

• a polyphenylene ether (A);
• a phosphorous-containing cyanate ester compound (B) represented by general formula (1):
• wherein X1 to X8 represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group, which may be the same or different from each other, and
• Z represents a group represented by general formula (2):
• wherein X9 represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group, which may be the same or different from each other, and a represents an integer of 1 to 4, b represents an integer of 0 to 4, and m represents an integer of 1 to 4, or
• a group represented by general formula (3):
• wherein c represents an integer of 0 to 4, and n represents an integer of 1 to 3;
• a non-halogenated epoxy resin (C);
• a cyanate ester compound (D) other than the compound represented by the formula (1);
• and
• a filler (E),
• wherein a content of the filler (E) is 10 to 200 parts by mass with respect to 100 parts by mass of a total of the (A) to (D) components, and
• wherein a content of the polyphenylene ether (A) is 50 to 90 parts by mass with respect to 100 parts by mass of a total of the (A) to (D) components.