An endoscope includes a lens, a lens frame that holds the lens, and a bonding member that water-tightly fixes the lens to the lens frame, the bonding member composed of Sn-alloy solder containing at least one of Zn, Sb, Al and In, having a melting point not higher than 200° C. and forming a chemical bond via oxygen, and the lens, the lens frame and the bonding member are provided at a distal end portion of an insertion portion.
