To provide a flexible synthetic resin hose having joint portions at both ends, easily and certainly connecting a hard drain port and a soft drain distributing pipe arranged in the distributing water pipe of an air conditioner or the like without using a separate joint member.

The soft synthetic resin joint portion 2 of a constant thickness and the hard synthetic resin joint portion 3 of a constant thickness are formed at one end and the other end of a soft synthetic resin hose body 1 formed by spirally winding a reinforcing spiral protrusion 4 on its peripheral surface, respectively. While the soft synthetic resin joint portion 2 is fitted to the hard drain port or the like without using a packing or the like, the hard synthetic resin joint portion 3 is inserted and fitted to the soft drain distributing pipe or the like without using the separate joint member, thereby connecting the hard drain port to the soft drain distributing pipe.