An apparatus for determining the filling level of at least one coin tube fillable with coins, comprising: at least one optical radiation transmitter, which is arranged in a defined position relative to the at least one coin tube, such that optical radiation emitted by the optical radiation transmitter hits the coins filled into the at least one coin tube and is reflected by coins filled into the at least one coin tube, further comprising at least one optical radiation receiver, which is arranged in a defined position relative to the at least one coin tube, such that optical radiation emitted by the at least one optical radiation transmitter and reflected by the coins filled into the at least one coin tube is received by the at least one optical radiation receiver as a measurement signal, and comprising a control and evaluation device, which is connected to the at least one optical radiation transmitter and the at least one optical radiation receiver, and is configured to control the at least one optical radiation transmitter for emitting optical radiation, and on the basis of a time period between the emission of optical radiation and the reception of the corresponding measurement signal by the at least one optical receiver determining the filling level of the at least one coin tube with coins, characterized in that the apparatus is provided for determining the filling level of a plurality of coin tubes fillable with coins, wherein a common optical radiation transmitter and/or a common optical radiation receiver is provided for a plurality of coin tubes or all coin tubes, wherein the common optical radiation transmitter and/or the common optical radiation receiver are optically connected to the coin tubes via an optical waveguide. at least one optical radiation transmitter, which is arranged in a defined position relative to the at least one coin tube, such that optical radiation emitted by the optical radiation transmitter hits the coins filled into the at least one coin tube and is reflected by coins filled into the at least one coin tube, further comprising at least one optical radiation receiver, which is arranged in a defined position relative to the at least one coin tube, such that optical radiation emitted by the at least one optical radiation transmitter and reflected by the coins filled into the at least one coin tube is received by the at least one optical radiation receiver as a measurement signal, and comprising a control and evaluation device, which is connected to the at least one optical radiation transmitter and the at least one optical radiation receiver, and is configured to control the at least one optical radiation transmitter for emitting optical radiation, and on the basis of a time period between the emission of optical radiation and the reception of the corresponding measurement signal by the at least one optical receiver determining the filling level of the at least one coin tube with coins, characterized in that the apparatus is provided for determining the filling level of a plurality of coin tubes fillable with coins, wherein a common optical radiation transmitter and/or a common optical radiation receiver is provided for a plurality of coin tubes or all coin tubes, wherein the common optical radiation transmitter and/or the common optical radiation receiver are optically connected to the coin tubes via an optical waveguide.