Novel pesticide, especially insecticides or miticides are provided.Pyrazole derivative and pesticides represented by the formula (1):wherein A1 is —N(O)m2 or —CR1, each of R1, R3, R4 is a hydrogen atom, a halogen atom, C1-C6 alkyl or the like, Ra is a hydrogen atom, C1-C6 alkyl or the like, Rb is —C(O)R7, —C(O)N(R8a)R8 or the like, each of R7, R8, R8a is a hydrogen atom, C1-C6 alkyl or the like, and m1 is an integer of 0 or 1.