A cut grass full-state detection apparatus that detects a full state of a grass collecting container that stores cut grass cut by a mower apparatus, comprising: a cut grass amount detection unit configured to detect the amount of cut grass stored in the grass collecting container; a notification unit (451, 451a, 451b), wherein the notification unit includes a first notification unit and a second notification unit; a timer; a control unit, the control unit being configured to instruct the timer to measure a time period that has elapsed from when the cut grass amount detection unit detected a predetermined amount of cut grass, and instruct the notification unit to issue an alarm when the cut grass amount detection unit continuously detects the predetermined amount of cut grass for a predetermined period; characterized in that it further comprises a drive detection unit configured to detect that the mower apparatus is being driven, the control unit is configured such that if the drive detection unit has not detected that the mower apparatus is being driven, the control unit instructs the first notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period, and if the drive detection unit has detected that the mower apparatus is being driven, the control unit instructs the first notification unit and the second notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period. a cut grass amount detection unit configured to detect the amount of cut grass stored in the grass collecting container; a notification unit (451, 451a, 451b), wherein the notification unit includes a first notification unit and a second notification unit; a timer; a control unit, the control unit being configured to instruct the timer to measure a time period that has elapsed from when the cut grass amount detection unit detected a predetermined amount of cut grass, and instruct the notification unit to issue an alarm when the cut grass amount detection unit continuously detects the predetermined amount of cut grass for a predetermined period; characterized in that it further comprises a drive detection unit configured to detect that the mower apparatus is being driven, the control unit is configured such that if the drive detection unit has not detected that the mower apparatus is being driven, the control unit instructs the first notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period, and if the drive detection unit has detected that the mower apparatus is being driven, the control unit instructs the first notification unit and the second notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period. if the drive detection unit has not detected that the mower apparatus is being driven, the control unit instructs the first notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period, and if the drive detection unit has detected that the mower apparatus is being driven, the control unit instructs the first notification unit and the second notification unit to issue an alarm when the cut grass amount detection unit has continuously detected the predetermined amount of cut grass for the predetermined period.