The present invention provides for example the following: an aptamer having inhibitory activity on FGF2 a complex that includes an aptamer having bonding activity with and inhibitory activity on FGF2 and a functional substance (for example an affinity substance a labeling substance an enzyme a drug delivery medium or a drug) and a medicine a diagnostic drug and a labeling agent that include an aptamer having bonding activity with and inhibitory activity on FGF2 or a complex which includes the aptamer and a functional substance.
