A diagnostic information supply apparatus for a construction machine, provided at a position remote from the construction machine in order to acquire chronological data relating to alarm/trouble occurrence information on the machine, chronological data relating to engine on/off and engine key switch on/off information, and chronological data relating to operational-state physical quantities, the apparatus comprising: item list display means that displays an item list of acquired alarm/trouble occurrence information; characterized in further comprising: first alarm/trouble occurrence information selection means for an operator to select first alarm/trouble occurrence information from the item list of acquired alarm/trouble occurrence information, displayed by the item list display means; first storage means that previously stores combinations of alarms/trouble events which are likely to have some association with probable causes; second alarm/trouble occurrence information selection means that automatically selects second alarm/trouble occurrence information with respect to the first alarm/trouble occurrence information selected by the first alarm/trouble occurrence information selection means, on the basis of the combination prestored by the first storage means; and alarm/trouble data display means that displays, together with the chronological data relating to the engine on/off and key switch on/off information, chronological data relating to the alarm/trouble occurrence information selected by at least the first alarm/trouble occurrence information selection means among the first and second alarm/trouble occurrence information selection means. item list display means that displays an item list of acquired alarm/trouble occurrence information; characterized in further comprising: first alarm/trouble occurrence information selection means for an operator to select first alarm/trouble occurrence information from the item list of acquired alarm/trouble occurrence information, displayed by the item list display means; first storage means that previously stores combinations of alarms/trouble events which are likely to have some association with probable causes; second alarm/trouble occurrence information selection means that automatically selects second alarm/trouble occurrence information with respect to the first alarm/trouble occurrence information selected by the first alarm/trouble occurrence information selection means, on the basis of the combination prestored by the first storage means; and alarm/trouble data display means that displays, together with the chronological data relating to the engine on/off and key switch on/off information, chronological data relating to the alarm/trouble occurrence information selected by at least the first alarm/trouble occurrence information selection means among the first and second alarm/trouble occurrence information selection means. first alarm/trouble occurrence information selection means for an operator to select first alarm/trouble occurrence information from the item list of acquired alarm/trouble occurrence information, displayed by the item list display means; first storage means that previously stores combinations of alarms/trouble events which are likely to have some association with probable causes; second alarm/trouble occurrence information selection means that automatically selects second alarm/trouble occurrence information with respect to the first alarm/trouble occurrence information selected by the first alarm/trouble occurrence information selection means, on the basis of the combination prestored by the first storage means; and alarm/trouble data display means that displays, together with the chronological data relating to the engine on/off and key switch on/off information, chronological data relating to the alarm/trouble occurrence information selected by at least the first alarm/trouble occurrence information selection means among the first and second alarm/trouble occurrence information selection means.