To provide an insertion portion for an endoscope in which flexibility of a flexible tube is easily and smoothly changed in the middle without changing thickness or hardness of outer skin of the flexible tube.
In an insertion portion for an endoscope in which plural wire guides 24 comprising tight winding coil pipes for inserting and guiding operation wires 23 are inserted and disposed in a flexible tube to enclose the inspection portion, a flexibility restricting pipe 25 of super-elastic alloy having a cross sectional form corresponding to a space form around the wire guide 24 is put around at least one wire guide 24 of the plural wire guides 24 in a part positioned in the flexible tube in a range from a base end position of the flexible tube to a middle position.
OGINO TAKAYUKI
HASHIYAMA TOSHIYUKI
