An automatic analysis apparatus, comprising: an incubator (111 to 111b) which accommodates a plurality of reaction vessels; a specimen dispensing mechanism (107 to 107d) which dispenses a specimen into each of the plurality of reaction vessels; a mounting unit (114 to 114d) which mounts a dispensing tip on the specimen dispensing mechanism (107 to 107d); a suction unit (106 to 106Sd) which sucks a specimen from a specimen vessel containing the specimen by means of the specimen dispensing mechanism (107 to 107d) having the dispensing tip mounted thereon; a discharging unit (111P to 111Pd) which is provided in the incubator (111 to 111b) and discharges the specimen from the specimen dispensing mechanism (107 to 107d) to the reaction vessel; a disposal unit (113 to 113d) which discards the dispensing tip; a sensor (112 to 112d) which detects whether the dispensing tip is mounted to the specimen dispensing mechanism (107 to 107d); and a control unit which controls the specimen dispensing mechanism (107 to 107d), wherein the mounting unit (114 to 114d), the suction unit (106 to 106Sd), the discharging unit (111P to 111Pd), and the disposal unit (113 to 113d) are arranged along a movement path (Rm) of the specimen dispensing mechanism (107 to 107d), the sensor (112 to 112d) is arranged so as to be able to detect the dispensing tip at a position sandwiched between any two of the mounting unit (114 to 114d), the suction unit (106 to 106Sd), the discharging unit (111P to 111Pd), and the disposal unit (113 to 113d), and the automatic analysis apparatus is characterized in that the mounting unit (114 to 114d) and the discharging unit (111P to 111Pd) are arranged on one side of the movement path (Rm) as viewed from a detection position of the sensor (112 to 112d), and the suction unit (106 to 106Sd) and the disposal unit (113 to 113d) are arranged on the other side of the movement path (Rm). an incubator (111 to 111b) which accommodates a plurality of reaction vessels; a specimen dispensing mechanism (107 to 107d) which dispenses a specimen into each of the plurality of reaction vessels; a mounting unit (114 to 114d) which mounts a dispensing tip on the specimen dispensing mechanism (107 to 107d); a suction unit (106 to 106Sd) which sucks a specimen from a specimen vessel containing the specimen by means of the specimen dispensing mechanism (107 to 107d) having the dispensing tip mounted thereon; a discharging unit (111P to 111Pd) which is provided in the incubator (111 to 111b) and discharges the specimen from the specimen dispensing mechanism (107 to 107d) to the reaction vessel; a disposal unit (113 to 113d) which discards the dispensing tip; a sensor (112 to 112d) which detects whether the dispensing tip is mounted to the specimen dispensing mechanism (107 to 107d); and a control unit which controls the specimen dispensing mechanism (107 to 107d), wherein the mounting unit (114 to 114d), the suction unit (106 to 106Sd), the discharging unit (111P to 111Pd), and the disposal unit (113 to 113d) are arranged along a movement path (Rm) of the specimen dispensing mechanism (107 to 107d), the sensor (112 to 112d) is arranged so as to be able to detect the dispensing tip at a position sandwiched between any two of the mounting unit (114 to 114d), the suction unit (106 to 106Sd), the discharging unit (111P to 111Pd), and the disposal unit (113 to 113d), and the automatic analysis apparatus is characterized in that the mounting unit (114 to 114d) and the discharging unit (111P to 111Pd) are arranged on one side of the movement path (Rm) as viewed from a detection position of the sensor (112 to 112d), and the suction unit (106 to 106Sd) and the disposal unit (113 to 113d) are arranged on the other side of the movement path (Rm).