A medical apparatus comprising: a storing section in which information concerning a drug movement in a living body is stored in advance for each of types of a plurality of fluorescent drugs; an image pickup section (1005, 1105) that picks up an image of an object in the subject; and a position information acquiring section that acquires position information of the image pickup section (1005, 1105) in the subject; characterized by further comprising: an arithmetic processing section that acquires, based on the information stored in the storing section, information concerning a target region of a subject to which a desired fluorescent drug is administered, information concerning a method of administering the desired fluorescent drug to the target region, information concerning start time of administration of the desired fluorescent drug, and information concerning diagnosis start time (Ts) corresponding to the desired fluorescent drug; and a light source control section that controls, at least from the administration start time to the diagnosis start time (Ts), irradiation of excitation light for exciting the desired fluorescent drug to a stopped state and controls so as to irradiate the excitation light based on the diagnosis start time (Ts) and the position information. a storing section in which information concerning a drug movement in a living body is stored in advance for each of types of a plurality of fluorescent drugs; an image pickup section (1005, 1105) that picks up an image of an object in the subject; and a position information acquiring section that acquires position information of the image pickup section (1005, 1105) in the subject; characterized by further comprising: an arithmetic processing section that acquires, based on the information stored in the storing section, information concerning a target region of a subject to which a desired fluorescent drug is administered, information concerning a method of administering the desired fluorescent drug to the target region, information concerning start time of administration of the desired fluorescent drug, and information concerning diagnosis start time (Ts) corresponding to the desired fluorescent drug; and a light source control section that controls, at least from the administration start time to the diagnosis start time (Ts), irradiation of excitation light for exciting the desired fluorescent drug to a stopped state and controls so as to irradiate the excitation light based on the diagnosis start time (Ts) and the position information. an arithmetic processing section that acquires, based on the information stored in the storing section, information concerning a target region of a subject to which a desired fluorescent drug is administered, information concerning a method of administering the desired fluorescent drug to the target region, information concerning start time of administration of the desired fluorescent drug, and information concerning diagnosis start time (Ts) corresponding to the desired fluorescent drug; and a light source control section that controls, at least from the administration start time to the diagnosis start time (Ts), irradiation of excitation light for exciting the desired fluorescent drug to a stopped state and controls so as to irradiate the excitation light based on the diagnosis start time (Ts) and the position information.