An assistant robot comprising: a base table; a holding section which is configured to hold a part of a body of a person in need of assistance and is capable of moving with respect to the base table at least in a vertical and inclined manner; an actuator (45, 32a1, 32b1) which is confgured to perform actions of the holding section with respect to the base table; an operation device which comprises a display section and an operation section that is configured to receive input operations from a user, wherein the operation section comprises cursor keys to move a cursor in upward, downward, right and left directions and has a function of vertical movement oparation section that is configured to be used by the person in need of assistance or an assistant to operate changes in a vertical-direction location of the holding section, so as to freely determine a vertical-direction starting location of the holding section; a first control section which is configured to determine an imput to the vertical movement operation section and, in a case in which an operation is input to the vertical movement operation section, to control the actuator (45, 32a1, 32b1) in accordance with the operation of the vertical movement operation section and vertically moves the holding section to the determined vertical-direction starting location; a memory section which memorizes in advance an action trajectory of the actuator (45, 32a1, 32b1) for moving the holding section from a standard seating posture to a standard standing posture; a correction section which is configured to correct the action trajectory of the actuator (45, 32a1, 32b1) on the basis of the vertical-direction starting location of the holding section, where the holding section has been moved to using the first control section, and a vertical-direction location of the standard seating posture; and a second control section which is configured to controls the actuator (45, 32a1, 32b1) on the basis of the corrected action trajectory and moves the holding section from the vertical-direction starting location to a predetermined standing posture. a base table; a holding section which is configured to hold a part of a body of a person in need of assistance and is capable of moving with respect to the base table at least in a vertical and inclined manner; an actuator (45, 32a1, 32b1) which is confgured to perform actions of the holding section with respect to the base table; an operation device which comprises a display section and an operation section that is configured to receive input operations from a user, wherein the operation section comprises cursor keys to move a cursor in upward, downward, right and left directions and has a function of vertical movement oparation section that is configured to be used by the person in need of assistance or an assistant to operate changes in a vertical-direction location of the holding section, so as to freely determine a vertical-direction starting location of the holding section; a first control section which is configured to determine an imput to the vertical movement operation section and, in a case in which an operation is input to the vertical movement operation section, to control the actuator (45, 32a1, 32b1) in accordance with the operation of the vertical movement operation section and vertically moves the holding section to the determined vertical-direction starting location; a memory section which memorizes in advance an action trajectory of the actuator (45, 32a1, 32b1) for moving the holding section from a standard seating posture to a standard standing posture; a correction section which is configured to correct the action trajectory of the actuator (45, 32a1, 32b1) on the basis of the vertical-direction starting location of the holding section, where the holding section has been moved to using the first control section, and a vertical-direction location of the standard seating posture; and a second control section which is configured to controls the actuator (45, 32a1, 32b1) on the basis of the corrected action trajectory and moves the holding section from the vertical-direction starting location to a predetermined standing posture.