Disclosed is a triazolopyridine compound which has a prolyl hydroxylase inhibitory action and erythropoietin production inducing activity. Specifically disclosed are: a compound represented by general formula [I] (wherein the symbols are as defined in the description), a pharmaceutically acceptable salt thereof or a solvate of the compound or salt； and a prolyl hydroxylase inhibitor and an erythropoietin production inducer, each containing the compound. The compound has a prolyl hydroxylase inhibitory action and erythropoietin production inducing activity, and is useful as an agent for prevention or treatment of various diseases and conditions (disorders) which are caused by a decrease in erythropoietin production.
