A malfunction detection apparatus for an engaging and disengaging controller that supplies a working oil of a predetermined pressure to an engaging and disengaging mechanism which engages and disengages a power transmission path to control engagement and disengagement of the power transmission path, wherein the engaging and disengaging controller comprises: a plurality of valves (157A, 157B) provided in series on the flow path of the working oil for opening and closing said flow path to the engaging and disengaging mechanism, and a plurality of opening/closing detection sections (161A, 161B) for respectively detecting the opened or closed state of each one of the valves (157A, 157B), wherein the malfunction detection apparatus comprises: an opening/closing control section (215/313, 223/303) which is configured to control the valves (157A, 157B) of the engaging and disengaging controller to be opened or closed such that the valves (157A, 157B) can be opened sequentially from those provided upstream of the flow path when the engaging and disengaging mechanism is applied, a time counting section (225A, 217B, 305A, 315B) which is configured to count a predetermined time from a start of an opening/closing control by the opening/closing control section (215/313, 223/303) every time each valve (157A, 157B) is controlled to be opened, and characterised by a malfunction detection section (219B, 227A) which is configured to determine that a respective valve (157A, 157B) which is controlled to be opened or the opening/closing detection section (161A, 161B) corresponding to that valve (157A, 157B) malfunctions in a case where the time counting section (225A, 217B, 305A, 315B) ends counting of the predetermined time in a state that detection results by the opening/closing detection section (161A, 161B) of the engaging and disengaging controller do not coincide with control details executed by the opening/closing control section (215/313, 223/303) every time each valve (157A, 157B) is controlled to be opened. a plurality of valves (157A, 157B) provided in series on the flow path of the working oil for opening and closing said flow path to the engaging and disengaging mechanism, and a plurality of opening/closing detection sections (161A, 161B) for respectively detecting the opened or closed state of each one of the valves (157A, 157B), an opening/closing control section (215/313, 223/303) which is configured to control the valves (157A, 157B) of the engaging and disengaging controller to be opened or closed such that the valves (157A, 157B) can be opened sequentially from those provided upstream of the flow path when the engaging and disengaging mechanism is applied, a time counting section (225A, 217B, 305A, 315B) which is configured to count a predetermined time from a start of an opening/closing control by the opening/closing control section (215/313, 223/303) every time each valve (157A, 157B) is controlled to be opened, and characterised by a malfunction detection section (219B, 227A) which is configured to determine that a respective valve (157A, 157B) which is controlled to be opened or the opening/closing detection section (161A, 161B) corresponding to that valve (157A, 157B) malfunctions in a case where the time counting section (225A, 217B, 305A, 315B) ends counting of the predetermined time in a state that detection results by the opening/closing detection section (161A, 161B) of the engaging and disengaging controller do not coincide with control details executed by the opening/closing control section (215/313, 223/303) every time each valve (157A, 157B) is controlled to be opened.