A horizontal articulated robot in which an arm moves in the horizontal direction for use with objects to be transferred may include a hand on which the objects are to be mounted. The arm may have at least two arm portions including a hand-side arm portion to which the hand is rotatably joined to the front end thereof; and a second hand-side arm portion to which the base end of the hand-side arm portion is rotatably joined to the front end thereof; and a main body portion to which the base end of the arm is rotatably joined. A level which may be attached to the hand, the arm or the main body portion after an inclination of a center axis of rotation of the hand-side arm portion with respect to the second hand-side arm portion is adjusted relative to the vertical direction.
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