the second embodiment of the present invention with a bottom bolt type pipe fastener all elements and features except for the engagement member 13 are same as the first embodiment and the explanation of which will be omitted in the case that pipe fastener 2 is a bolt the width of channel groove 12 is constituted to be approximately equal to the width of a bolt head part with certain specifications as such when the bolt head part is slid from the open side of channel groove 12 to the interior thereof this bolt head part will be restrained by both wall surfaces of both sides of engagement member 13 thus preventing rotation as is described above there is the engagement sleeve 13 a protruding like an eave of a roof into the cross section of groove 12 formed in the longitudinal direction of the support base 1 in the case that this engagement sleeve 13 a is in particular an l shaped cross section a hook 21 of the pipe fastener 2 will push up engagement sleeve 13 a from below when the bolt of pipe fastener 2 installing pipe p is tightened then if the cross section of support base 1 is formed by a relatively thin synthetic resin or a thin steel plate the tightening of.