The present invention provides: a bicyclic heterocyclic amide derivative that is represented by formula (1), that shows excellent cancer cell sphere forming ability suppressing effect, and that is useful as an orally administrable antitumor agent； and a pharmaceutically acceptable salt thereof. [In the formula: ring Q1 represents an optionally substituted C6-10 aryl group or the like； R1 and R2 independently represent a hydrogen atom or the like； W1 represents an optionally substituted C1-4 alkylene group； W2 represents -NR3aC(O)- or the like (wherein, R3a represents a hydrogen atom or a C1-6 alkyl group)； Cy1 represents a group represented by formula (11) or the like； ring Q2 represents an optionally substituted benzene ring or the like； n and m each independently represent 0, 1, or 2； n and m are not simultaneously 0； X represents NR5 or the like； R5 represents a hydrogen atom or the like； p represents 1, 2, 3, 4, or 5； and R4 represents, independently when more than one thereof exists, a hydrogen atom or the like.]
