Onium salt of nitrogen-containing heteroaryl compound and pest control agent

A compound of formula (I) or formula (II):

• (in the formulae (I) and (II),
• Q1 is a pyrazole ring, an imidazole ring, a 1,2,4-triazole ring, an oxazole ring, a thiazole ring, an isoxazole ring, an isothiazole ring, a pyrazine ring, a pyrimidine ring, or a pyridazine ring,
• G1 is a nitrogen atom or a carbon atom,
• X1 is a halogeno group, a substituted or unsubstituted C1-6 alkyl group, a substituted or unsubstituted C2-6 alkenyl group, a substituted or unsubstituted C2-6 alkynyl group, a substituted or unsubstituted C1-6 alkoxy group, a substituted or unsubstituted CT-6 alkylthio group, a substituted or unsubstituted C1-6 alkylsulfinyl group, a substituted or unsubstituted C1-6 alkylsulfonyl group, a substituted or unsubstituted C3-8 cycloalkyl group, a substituted or unsubstituted C6-10 aryl group, a substituted or unsubstituted 5- or 6-membered heteroaryl group, a pentafluorosulfanyl group, a nitro group, or a cyano group,
• m indicates a number of X1, and is an integer of 1 to 3 when Q1 is a pyrazole ring, an imidazole ring, or a 1,2,4-triazole ring, and is an integer of 0 to 3 when Q1 is an oxazole ring, a thiazole ring, an isoxazole ring, an isothiazole ring, a pyrazine ring, a pyrimidine ring, or a pyridazine ring,
• X1 on adjacent carbon atoms may form together a cyclohexene ring including the two carbon atoms,
• A is an oxygen atom or a sulfur atom,
• Y is a single bond, or a substituted or unsubstituted C2-6 alkenylene group,
• Q2 is a benzene ring, a naphthalene ring, or a 5- to 10-membered heteroaryl ring,
• X2 is a halogeno group, a substituted or unsubstituted C1-6 alkyl group, a substituted or unsubstituted C2-6 alkenyl group, a substituted or unsubstituted C2-6 alkynyl group, a hydroxy group, a substituted or unsubstituted C1-6 alkoxy group, a substituted or unsubstituted C2-6 alkenyloxy group, a substituted or unsubstituted C2-6 alkynyloxy group, a substituted or unsubstituted C1-6 alkylthio group, a substituted or unsubstituted C1-6 alkylsulfinyl group, a substituted or unsubstituted C1-6 alkylsulfonyl group, a substituted or unsubstituted C3-8 cycloalkyl group, a substituted or unsubstituted C3-8 cycloalkyloxy group, a substituted or unsubstituted C6-10 aryl group, a substituted or unsubstituted C6-10 aryloxy group, a substituted or unsubstituted 5- or 6-membered heteroaryl group, a substituted or unsubstituted 5- or 6-membered heteroaryloxy group, a formyl group, a group of R—CO—, a group of RO—CO—, an amino group, a group of RNH—, a group of R2N—, a group of RCONH—, a group of RO—CONH—, a carbamoyl group, a group of RNH—CO—, a group of R2N—CO—, a group of RO—N═CH—, a pentafluorosulfanyl group, a nitro group, or a cyano group,
• R is each independently a substituted or unsubstituted C1-6 alkyl group, a substituted or unsubstituted C6-10 aryl group, or a substituted or unsubstituted 5- or 6-membered heteroaryl group,
• X3 is a halogeno group, a substituted or unsubstituted C1-6 alkyl group, a substituted or unsubstituted C1-6 alkoxy group, a substituted or unsubstituted C1-6 alkylthio group, a substituted or unsubstituted C1-6 alkylsulfinyl group, a substituted or unsubstituted C1-6 alkylsulfonyl group, a nitro group, or a cyano group,
• n indicates a number of X3, and n is an integer of 0 to 4, when Q2 is a benzene ring, and is an integer of 0 to 3, when Q2 is a 5- or 6-membered heteroaryl ring,
• X2 and X3 on adjacent carbon atoms may form together a substituted or unsubstituted 5-membered hetero ring including the two carbon atoms,
• Zq- is a counter ion, and
• q indicates a valence of the counter ion and is 1 or 2).