The present invention relates to a bedchair for a patient convertible to a bed and a wheelchair equipped with a sitting toilet, which can be used as a movable bed during a normal time by a lying patient who cannot stand on his/her own, for example, and which can change the shape to a wheelchair of a sitting toilet chair type during urination/defecation such that, by minimizing the patient movement, not only is the patient provided with convenience in use, but the guardian can also nurse the patient more easily. The bedchair for a patient convertible to a bed and a wheelchair equipped with a sitting toilet according to the present invention comprises: a main frame, which is formed in a quadrangular shape such that an installation space is formed at the center thereof, which has a first driving screw shaft rotatably installed on the rear side thereof, and which has a second driving screw shaft installed on the front side thereof a first movable frame coupled to the rear side of the main frame to be able to make a sliding movement a first sliding movement mechanism interposed between the first driving screw shaft of the main frame and the first movable frame a second movable frame, which is coupled to the front side of the main frame to be able to make a sliding movement, and which interworks and makes a sliding movement in the opposite direction to the first movable frame a second sliding movement mechanism interposed between the first driving screw shaft of the main frame and the second movable frame a back support frame, which is rotatably coupled to the rear side of the main frame, which is supported by the first movable frame, and the angle of which is adjusted on the main frame according to whether the first movable frame moves or not a foldable leg support plate, which is rotatably coupled to the front side of the main frame, which is connected to the second movable frame to be foldable, which is folded on the second movable frame or unfolded therefrom according
