A heat exchanger with a receiver-tank, comprising: a heat exchanger main body including a pair of headers and a plurality of heat exchanging tubes disposed in parallel with opposite ends thereof communicated with said headers, wherein a refrigerant is condensed by a condensing portion constituted by said heat exchanging tubes; a receiver-tank provided with a receiver-tank inlet and a receiver-tank outlet at a lower end thereof, wherein the refrigerant introduced via said receiver-tank inlet is stored and only the liquefied refrigerant flows out of said receiver-tank outlet; and a joint member for connecting said receiver-tank to one of said pair of headers, wherein said joint member includes a joint member main body to be attached to the lower end of said receiver-tank, wherein said joint member further includes an embedding portion provided at a side portion of said joint member main body to be embedded in said one of said pair of headers, and an inlet flow passage having an inlet side end portion disposed at an upper end surface of said embedding portion to be communicated with said condensing portion and an outlet side end portion disposed at an upper end surface of said joint member main body to be communicated with said receiver-tank inlet, characterized in that a flange-like partition piece protruded outwardly is integrally formed at an upper end periphery of said embedding portion of said joint member, a peripheral edge of said flange-like partition piece being joined to an inner peripheral surface of said one of said pair of headers, and an inside of said one of said pair of headers being divided by said flange-like partition piece, whereby the refrigerant condensed by said condensing portion is introduced into an inside of said receiver-tank via said inlet side end portion of said inlet flow passage in said joint member. a heat exchanger main body including a pair of headers and a plurality of heat exchanging tubes disposed in parallel with opposite ends thereof communicated with said headers, wherein a refrigerant is condensed by a condensing portion constituted by said heat exchanging tubes; a receiver-tank provided with a receiver-tank inlet and a receiver-tank outlet at a lower end thereof, wherein the refrigerant introduced via said receiver-tank inlet is stored and only the liquefied refrigerant flows out of said receiver-tank outlet; and a joint member for connecting said receiver-tank to one of said pair of headers, wherein said joint member includes a joint member main body to be attached to the lower end of said receiver-tank, wherein said joint member further includes an embedding portion provided at a side portion of said joint member main body to be embedded in said one of said pair of headers, and an inlet flow passage having an inlet side end portion disposed at an upper end surface of said embedding portion to be communicated with said condensing portion and an outlet side end portion disposed at an upper end surface of said joint member main body to be communicated with said receiver-tank inlet, characterized in that a flange-like partition piece protruded outwardly is integrally formed at an upper end periphery of said embedding portion of said joint member, a peripheral edge of said flange-like partition piece being joined to an inner peripheral surface of said one of said pair of headers, and an inside of said one of said pair of headers being divided by said flange-like partition piece, whereby the refrigerant condensed by said condensing portion is introduced into an inside of said receiver-tank via said inlet side end portion of said inlet flow passage in said joint member.