Provided are a novel pest control agent composition and, in particular, a composition for a sterilising agent. A sterilising or bactericidal composition which contains: one or more compounds selected from oxime-substituted amide compounds represented by formula (I), N-oxides thereof, and salts thereof; and one or more compounds selected from known sterilising or bactericidal compounds. [In the formula, G1 represents a structure such as G1-1 or G1-27, G2 represents a structure such as G2-2, W represents an oxygen atom or the like, X1 represents difluoromethyl, trifluoromethyl, or the like, X2, X3, X4, and X5 each independently represent a hydrogen atom or the like, Y1 represents a halogen atom or the like, Y2 represents a hydrogen atom, a halogen atom, or the like, Y3 represents a halogen atom, trifluoromethyl, an alkynyl containing 2-6 carbon atoms, or the like, Y4 represents a hydrogen atom or the like, R1 represents an alkyl containing 1-6 carbon atoms, a haloalkyl containing 1-4 carbon atoms, or the like, R2 and R3 each independently represent a hydrogen atom, a methyl, or the like, R4 represents a hydrogen atom or the like, and R5 represents methyl or the like.]