Drainage device which can be installed at least partially in an opening in the floor of a room, comprising - a baseplate having an opening through which wastewater can flow; - at least one part which can be premounted in the floor region; - first adjustment means which, during mounting of the baseplate, allow a horizontal adjustment of the baseplate with respect to the at least one part which can be premounted in the floor region, wherein the first adjustment means comprise a first flange which extends horizontally in the installed state and which can be moved horizontally in the installed state, and a receptacle in which the first flange can engage and can be able to move horizontally therein in the installed state, wherein the receptacle is formed by a first, annular part and a second, annular part which, in the installed state, are arranged so as to be vertically spaced apart from one another at least in certain portions, with the result that the thus resulting vertical interspace forms the receptacle, wherein the first annular part has a portion which extends horizontally in the installed state and which serves as a bearing surface for the first flange; - inlet means which, in the installed state, can be arranged above or in the opening of the baseplate; characterized in that - the drainage device comprises second adjustment means which, during mounting, allow a horizontal adjustment of the inlet means with respect to the baseplate, wherein the second adjustment means comprise a second flange which extends horizontally in the installed state and which is movable horizontally in the installed state and/or during mounting, wherein the portion of the first annular part that extends horizontally in the installed state serves as a bearing surface for the second flange. - a baseplate having an opening through which wastewater can flow; - at least one part which can be premounted in the floor region; - first adjustment means which, during mounting of the baseplate, allow a horizontal adjustment of the baseplate with respect to the at least one part which can be premounted in the floor region, wherein the first adjustment means comprise a first flange which extends horizontally in the installed state and which can be moved horizontally in the installed state, and a receptacle in which the first flange can engage and can be able to move horizontally therein in the installed state, wherein the receptacle is formed by a first, annular part and a second, annular part which, in the installed state, are arranged so as to be vertically spaced apart from one another at least in certain portions, with the result that the thus resulting vertical interspace forms the receptacle, wherein the first annular part has a portion which extends horizontally in the installed state and which serves as a bearing surface for the first flange; - inlet means which, in the installed state, can be arranged above or in the opening of the baseplate; characterized in that - the drainage device comprises second adjustment means which, during mounting, allow a horizontal adjustment of the inlet means with respect to the baseplate, wherein the second adjustment means comprise a second flange which extends horizontally in the installed state and which is movable horizontally in the installed state and/or during mounting, wherein the portion of the first annular part that extends horizontally in the installed state serves as a bearing surface for the second flange.