A support pillow that comprises a pillow body having a medial region and two curved arms that extend from the medial region to define a generally open well. The mechanisms execute a branch instruction in the portion of code. An angle calculation section obtains an angle formed by a normal line drawn from each of the three sides to the first candidate position and a standard line oriented in a specific direction and passing a point at which the normal line and each of the three sides cross. 5\u03a9 or lower, and the resistance of the roller at an applied voltage of 5 V is 106 to 108\u03a9. After passing the glare restraining unit, the light converges.