For example, an agent for preventing and/or treating movement disorder comprising, as an active ingredient, a triazolopyrimidine derivative having an adenosine A2A receptor antagonistic action, which is represented by the following formula (I): (wherein R1 represents substituted or unsubstituted aryl or a substituted or unsubstituted heterocyclic group, R2 represents a hydrogen atom, or the like, R3 represents —WR4, or the like, and Q1 represents a hydrogen atom or 3,4-dimethoxybenzyl), or a pharmaceutically acceptable salt thereof, and the like are provided.