A robot hand comprising a pair of bits that are configured to hold a microtube by causing the pair of bits to perform an opening-closing operation, each bit of the pair of bits comprising: a lug configured to come into contact with an outer peripheral surface of a container body of the microtube or an outer peripheral surface of a cap portion of the microtube as a result of the opening-closing operation; and a recess having a rectangular shape, formed in each of the pair of bits so that the recesses oppose each other and each recess includes a pair of surfaces between which both a part of the cap portion and a part of a flange of the microtube are positioned while the lug is in contact with the outer peripheral surface of the container body; characterized in that the robot hand is further configured to hold a culture vessel and in that the pair of bits are plate-shaped and include four rod-shaped holding members that have a length greater than or equal to an external dimension of a culture vessel in a depth direction of the culture vessel, wherein two of the holding members are arranged parallel to each other on each of the pair of bits, each rod-shaped holding member extending from one of the surfaces of the bits in the thickness direction of the plate-shaped bits, wherein distal ends of the holding members are on the same imaginary plane, and wherein the holding members are arranged so as to surround an outer periphery of the culture vessel by moving the holding members in a direction from an open side to a bottom side of the culture vessel, and the pair of bits is closed, so that an outer periphery of a bottom portion of the culture vessel is held by the distal ends of the holding members and an outer peripheral surface of the culture vessel is held by outer peripheral surfaces of portions of the holding members on a proximal side of the distal ends. a lug configured to come into contact with an outer peripheral surface of a container body of the microtube or an outer peripheral surface of a cap portion of the microtube as a result of the opening-closing operation; and a recess having a rectangular shape, formed in each of the pair of bits so that the recesses oppose each other and each recess includes a pair of surfaces between which both a part of the cap portion and a part of a flange of the microtube are positioned while the lug is in contact with the outer peripheral surface of the container body; characterized in that the robot hand is further configured to hold a culture vessel and in that the pair of bits are plate-shaped and include four rod-shaped holding members that have a length greater than or equal to an external dimension of a culture vessel in a depth direction of the culture vessel, wherein two of the holding members are arranged parallel to each other on each of the pair of bits, each rod-shaped holding member extending from one of the surfaces of the bits in the thickness direction of the plate-shaped bits, wherein distal ends of the holding members are on the same imaginary plane, and wherein the holding members are arranged so as to surround an outer periphery of the culture vessel by moving the holding members in a direction from an open side to a bottom side of the culture vessel, and the pair of bits is closed, so that an outer periphery of a bottom portion of the culture vessel is held by the distal ends of the holding members and an outer peripheral surface of the culture vessel is held by outer peripheral surfaces of portions of the holding members on a proximal side of the distal ends.