The present invention provides novel use of specific bicyclic nitrogen-containing heterocyclic compounds as PDE7 inhibitors, and novel bicyclic nitrogen-containing heterocyclic compounds having PDE7 inhibitory effects, methods for producing the same, use of the same, pharmaceutical compositions comprising the PDE7 inhibitors or the compounds, and the like. Specifically, the present invention provides a PDE7 inhibitor comprising a compound of Formula (I): [wherein the symbols are as described herein] or a pharmacologically acceptable salt thereof as an active ingredient.本發明提供特定之二環式含氮雜環化合物作為PDE7阻礙劑之新穎用途、具有PDE7阻礙作用之新穎二環式含氮雜環化合物、其製造方法及其用途，以及含有上述PDE7阻礙劑或化合物之醫藥組成物等。具體而言，本發明提供以式(I)表示之化合物或其藥理學上容許之鹽作為有效成分之PDE7阻礙劑：式(I)： [式中，符號如說明書中所述]。
