[OBJECT]The present invention provides an 18F-labeled azide compound usable in the Huisgen reaction which enables 18F-labeling although only a small quantity of alkyne compound is available as a counterpart substrate, more specifically the 18F-labeled azide compound enabling the PET to be applied to peptides or oligonucleotides and enabling the 18F-labeling of any sites of oligonucleotide other than the 5 end or 3 end thereof, a reagent for 18F-labeling, and a method for 18F-labeling of an alkyne compound using the same.[SOLVING MEANS]An 18F-labeled azide compound according to the present invention is expressed by the following structural formula 1.
