Abstract: The present invention aims to provide a transdermal formulation in which apomorphine or a salt thereof is dissolved at a high concentration, so that a sufficient amount of apomorphine for treatment can be absorbed in a short time, and can be administered continuously. The present invention can include, for example, a transdermal formulation, comprising apomorphine or a salt thereof, a polyhydric alcohol with a carbon number of 6 or less and/or a low molecular weight polyethylene glycol, and propylene carbonate. According to the present invention, it is possible to prepare a solution containing apomorphine in a high concentration, and to allow a sufficient amount of apomorphine to be absorbed into the body through the skin in a short time and administered continuously.