Patent ID: 7722086

Claim:
A falling-off prevention structure for a connector in which a pipe member and a pipe-shaped connector are connected together, the falling-off prevention structure comprising: a pipe member having a first flange and a second flange that project outwardly from an outer peripheral surface of the pipe member, wherein the first flange and the second flange are provided in a vicinity of a tip end portion of the pipe member, in sequence from the tip end portion side of the pipe member; a pipe-shaped connector comprising a larger diameter portion provided at one end side of the pipe-shaped connector, and a smaller diameter portion provided at another end side of the pipe-shaped connector, wherein the larger diameter portion and the smaller diameter portion are connected via a step portion, wherein the pipe member and the pipe-shaped connector are connected by inserting the first flange in an inner peripheral surface of the larger diameter portion; and a box-shaped falling-off preventing holder placed over the pipe member and the pipe-shaped connector so as to straddle the pipe member and the pipe-shaped connector, the falling-off preventing holder comprising: an open surface, a first end wall and a second end wall which are opposed to axial opposite ends of the pipe-shaped connector in a state where the falling-off preventing holder is placed over the pipe-shaped connector, the first end wall including a first cutout connecting to the open surface, wherein the first cutout is fitted on the smaller diameter portion and abuts the step portion, the second end wall including a second cutout connecting to the open surface, wherein the second cutout is fitted on the pipe member and abuts the second flange, and a pressure rib provided at the first end wall, wherein the pressure rib is compressed by the step portion of the pipe-shaped connector and hence is plastically deformed.