The present invention provides: a therapeutic and/or preventive agent for chronic skin diseases which comprises (a) a phosphodiesterase (PDE)-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a steroid agent as active ingredients; a therapeutic and/or preventive agent for chronic skin diseases to be administered simultaneously or separately with an interval which comprises (a) a PDE-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a steroid agent, as active ingredients; a kit for treating and/or preventing chronic skin diseases characterized by comprising (a) a first component comprising a PDE-IV inhibitor or a pharmaceutically acceptable salt thereof and (b) a second component comprising a steroid agent; and the like.