A vertically articulated robot (1, 1A-1D) comprising: a base configured to be attached to an attachment surface which is a lower surface of a ceiling of an installation space, wherein the attachment surface is a flat surface, a first arm which is connected to the base through a first joint so as to be rotatable relative to the base around a first rotation axis, wherein the first rotation axis is adapted to coincide with a normal line of the lower surface of the ceiling, and a second arm which is connected to the first arm through a second joint so as to be rotatable relative to the first arm around a second rotation axis having an axial direction different from, rather than parallel to, the axial direction of the first rotation axis, and a third arm which is connected to the second arm through a third joint so as to be rotatable relative to the second arm around a third rotation axis which is different from the axial direction of the first rotation axis, wherein the base, the arms (12, 13), and the joints (171, 172) are configured such that an angle (θ) formed by the first rotation axis and a center axis of the second arm passing through the second rotation axis and the third rotation axis can be set to 0°, when seen in the axial direction of the second rotation axis, by not rotating the first arm but rotating the second arm and the third arm, and wherein the second arm does not interfere with the attachment surface when the base is attached to the attachment surface and the angle is 0°, and characterised in that the third arm is configured to be actuated independently from an actuation of the second arm. a base configured to be attached to an attachment surface which is a lower surface of a ceiling of an installation space, wherein the attachment surface is a flat surface, a first arm which is connected to the base through a first joint so as to be rotatable relative to the base around a first rotation axis, wherein the first rotation axis is adapted to coincide with a normal line of the lower surface of the ceiling, and a second arm which is connected to the first arm through a second joint so as to be rotatable relative to the first arm around a second rotation axis having an axial direction different from, rather than parallel to, the axial direction of the first rotation axis, and a third arm which is connected to the second arm through a third joint so as to be rotatable relative to the second arm around a third rotation axis which is different from the axial direction of the first rotation axis, wherein the base, the arms (12, 13), and the joints (171, 172) are configured such that an angle (θ) formed by the first rotation axis and a center axis of the second arm passing through the second rotation axis and the third rotation axis can be set to 0°, when seen in the axial direction of the second rotation axis, by not rotating the first arm but rotating the second arm and the third arm, and wherein the second arm does not interfere with the attachment surface when the base is attached to the attachment surface and the angle is 0°, and characterised in that the third arm is configured to be actuated independently from an actuation of the second arm.