INSERTION GUIDE AND INSERTION-GUIDING DEVICE

Provided is an insertion guide being capable of performing high-speed insertion of a shaft (10) into a hole (30) while performing accurate rotation correction between a shaft (10) and a hole (30) and phase correction between the shaft and the hole. The shaft (10) includes: a first guide portion (100), provided at a distal end of the shaft to be inserted into the hole (30), and having a diameter smaller than a diameter of the hole (30); a second guide portion (300), provided on a base end side of a first narrow cylindrical portion (200), and having a diameter smaller than the diameter of the hole (30) and larger than a diameter of the first narrow cylindrical portion (200); and a third guide portion (500), provided at the distal end of the shaft (10), and is a recessed portion to be engaged with a protruding portion formed in the hole (30) to determine a phase being rotation around an axis of the shaft (10). The shaft (10) has such a shape that the shaft (10), inserting into the hole (30) and being inclined with respect to the hole (30), is brought into contact with the hole at two points or less before the third guide portion (500) is brought into contact with the protruding portion.