The present invention provides an anti-tumor agent comprising a compound of formula (1) or a pharmaceutically acceptable salt thereof, wherein ring Q1 is optionally-substituted C6-10 aryl, etc.； R1 and R2 are independently hydrogen atom, etc.； W1 is C1-4 alkylene which may be optionally substituted with 1 to 3 fluorine atoms or C3-7 cycloalkyl； W2 is -NR4aC(O)-, etc. wherein R4a is hydrogen atom or C1-6 alkyl； ring Q2 is optionally-substituted C6-10 aryl, etc., in combination with at least one agent selected from the group consisting of an anti-cancer agent, an anti-diabetic agent, an agent for treating dyslipidemia, an agent for treating multiple sclerosis, a steroidal anti-inflammatory agent, a non-steroidal anti-inflammatory agent, an anti-fungal agent, and a pharmaceutically acceptable salt thereof.
