A patch comprising a support layer and an adhesive agent layer, whereinthe adhesive agent layer contains diclofenac or a pharmaceutically acceptable salt thereof, glycerin, butylene glycol, and poly(ethylene glycol)monooleate, and a mass ratio between the butylene glycol and the poly(ethylene glycol)monooleate (mass of butylene glycol:mass of poly(ethylene glycol)monooleate) is 1:1 to 4:1.
