Method for rapid detection of african swine fever virus using lamp method in which multiple primer sets are combined

[Problem] To develop a method for detecting the presence/absence of African swine fever virus infection easily and rapidly. [Solution] The present invention provides: an oligonucleotide primer designed on the basis of an optional base sequence, or a base sequence complimentary thereto, the optional base sequence being selected from base sequence Nos. 1503 to 2072 (hereinafter "target nucleic acid") of the base sequence of African swine cholera virus genome (GenBank accession No. AY578689) depicted in SEQ ID NO: 1; and a method for amplifying nucleic acids, such as the LAMP method in which such oligonucleotide primers are used.