A vehicle coasting control device comprising: a coasting control execution unit that recognizes when coasting control start conditions are satisfied, and that disengages a clutch in a driving situation in which an engine does no work for the outside and lowers an engine RPM so as to start coasting control; a turning recognition unit that recognizes that the vehicle is turning; and a unit for prohibiting the coasting control during turning that prohibits the coasting control when the turning recognition unit recognizes that the vehicle is turning, wherein the unit for prohibiting the coasting control during the turning prohibits the coasting control execution unit from starting the coasting control, even if the coasting control start conditions are satisfied, characterized by a coasting control determination map to be referred to by a clutch rotation speed and an accelerator opening degree, wherein the coasting control execution unit starts coasting control by disengaging the clutch and lowering the engine RPM when plotted points of the clutch rotation speed and the accelerator opening degree on the coasting control determination map are within a coasting control available region, an accelerator pedal operation speed is within a predetermined range, and plotted points of the clutch rotation speed and the accelerator opening degree pass a coasting control threshold line in a direction where the accelerator opening degree decreases and terminates coasting control when the accelerator pedal operation speed goes out of the predetermined range or the plotted points go out of the coasting control available region. a coasting control execution unit that recognizes when coasting control start conditions are satisfied, and that disengages a clutch in a driving situation in which an engine does no work for the outside and lowers an engine RPM so as to start coasting control; a turning recognition unit that recognizes that the vehicle is turning; and a unit for prohibiting the coasting control during turning that prohibits the coasting control when the turning recognition unit recognizes that the vehicle is turning, wherein the unit for prohibiting the coasting control during the turning prohibits the coasting control execution unit from starting the coasting control, even if the coasting control start conditions are satisfied, characterized by a coasting control determination map to be referred to by a clutch rotation speed and an accelerator opening degree, wherein the coasting control execution unit starts coasting control by disengaging the clutch and lowering the engine RPM when plotted points of the clutch rotation speed and the accelerator opening degree on the coasting control determination map are within a coasting control available region, an accelerator pedal operation speed is within a predetermined range, and plotted points of the clutch rotation speed and the accelerator opening degree pass a coasting control threshold line in a direction where the accelerator opening degree decreases and terminates coasting control when the accelerator pedal operation speed goes out of the predetermined range or the plotted points go out of the coasting control available region.