The present invention provides a tetrazolinone represented by formula (I) and a pest control agent comprising the same, and their use thereof. Formula (I) [wherein, W1 represents an oxygen atom or a sulfur atom； W2 represents a hydrogen atom, or a C1-C6 chain hydrocarbon group； R15 and R16 represent a halogen atom and the like； u is 0, 1, 2 or 3； the combination of E, G, X1, Y1 and Z1 represents any one of the combinations of the following a and the like: a: a combination wherein E represents #—；C(X1)(Y1)—；O—；N═；C(Z1)—；, #—；C(X1)(Y1)—；S—；N═；C(Z1)—；, #—；C(X1)(Y1)—；O—；N═；C(Z1)—；O—；CH2—；, #—；C(X1)(Y1)—；O—；N═；C(Z1)—；S—；CH2—；, #—；C(X1)(Y1)—；S—；N═；C(Z1)—；O—；CH2—；, #—；C(X1)(Y1)—；S—；N═；C(Z1)—；S—；CH2—；, #—；C(Z1)═；N—；N═；C(Z2)—；, #—；C(X1)═；C(Y1)—；C(Z1)═；N—；O—；CH2—； or #—；C(X1)═；C(Y1)—；C(Z1)═；N—；S—；CH2—；； G represents a C1-C6 chain hydrocarbon group, a (C1-C6 alkoxy)C1-C6 alkyl group, a (C1-C6 alkylthio)C1-C6 alkyl group {the C1-C6 chain hydrocarbon group, the (C1-C6 alkoxy)C1-C6 alkyl group, and the (C1-C6 alkylthio)C1-C6 alkyl group may have one or more substituents selected from Group S} or R1-T1-, X1 and Y1, which are identical to or different from each other, independently represents substituents selected from Group T, and Z1 represents a substituent selected from Group V.]
