[Problem] To provide a compound that has the effect of inhibiting PDE9 and is useful as an active ingredient in a therapeutic and/or prophylactic agent for urine collection disorders urination disorders diseases of the bladder and urinary system and the like. [Solution] Investigating compounds that have the effect of inhibiting PDE9 and are useful as active ingredients in a therapeutic and/or prophylactic agent for urine collection disorders urination disorders diseases of the bladder and urinary system and the like the inventors of the present invention verified that an imidazoquinoxaline compound or a triazolo quinoxaline compound has the effect of inhibiting PDE9 thereby completing the present invention. This imidazoquinoxaline compound or triazolo quinoxaline compound has the effect of inhibiting PDE9 and can be used a therapeutic and/or prophylactic agent for urine collection disorders urination disorders diseases of the bladder and urinary system and the like.
