An absolute encoder includes a circuit board disposed away from a rotation shaft of a motor. The circuit board includes first fixing portions and a second fixing portion. At each of the first fixing portions, an adjustment portion is disposed between the circuit board and a top end portion of a given pillar is provided, the adjustment portion being set to adjust a distance between the circuit board and the top end portion of the given pillar, so that a height of the circuit board at each first fixing portion is set to be the same as a height of the circuit board at the second fixing portion. Each adjustment portion is a resist layer formed between a surface of the circuit board and a top end surface of a given first pillar.