The present invention relates to a compound that has URAT1 inhibitory action, and a URAT1 inhibitor, a blood uric acid level-reducing agent and a pharmaceutical composition comprising the compound. More specifically, the present invention relates to a compound represented by Formula (I) below.[in the formula,R1 is -Q1-A1 and the like； ---- is a double bond or a single bond； when ---- is a double bond, W1 is a nitrogen atom or a group represented by the general formula: =C(Ra)-, and W2 is a nitrogen atom or a group represented by the general formula: =C(Rb) -； when ---- is a single bond, W1 is a group represented by the general formula: -C(Raa)(Rab)- or a group represented by the general formula: -(C=O) -, and W2 is a group represented by the general formula: C(Rba)(Rbb)-, a group represented by the general formula: - (C=O) - or a group represented by the general formula: -N(Rbc)-； W3, W4 and W5 are each independently a nitrogen atom or a methine group and the like that may have a substituent； X is a single bond, an oxygen atom and the like； Y is a single bond or (CRYiRYi')n； and Z is a hydroxyl group or COOR2 and the like.
