A heat pipe structure comprising: a base block including a rear surface part thermally connectable to a heat generating body; and a heat pipe including a heat receiving tubular portion fixed to a front surface part of the base block and disposed along an in-plane direction of the base block , wherein the base block has a longitudinal direction and a width direction and includes a recessed part in which the heat receiving tubular portion is accommodated, and a container part of the heat pipe is caulked and fixed in the recessed part and a first metal part containing first metal having a melting point equal to or higher than 130°C and equal to or lower than 400°C and/or a first metal alloy having a melting point equal to or higher than 130°C and equal to or lower than 400°C is formed between the recessed part and an outer surface of the container part , and the base block includes the recessed part and a pair of wall parts projecting along an outer circumferential surface of the heat receiving tubular portion from width direction both sides of the recessed part , and the container part of the heat pipe is caulked and fixed to the recessed part and the pair of wall parts , characterised in that a second metal part containing second metal having a melting point higher than 400°C and equal to or lower than 1500°C and/or a second metal alloy having a melting point higher than 400°C and equal to or lower than 1500°C is further formed between the outer surface of the container part and the first metal part , and wherein the first metal part extends from between a half on a base block side in the container part and the recessed part to between the container part and the pair of wall parts . a base block including a rear surface part thermally connectable to a heat generating body; and a heat pipe including a heat receiving tubular portion fixed to a front surface part of the base block and disposed along an in-plane direction of the base block , wherein the base block has a longitudinal direction and a width direction and includes a recessed part in which the heat receiving tubular portion is accommodated, and a container part of the heat pipe is caulked and fixed in the recessed part and a first metal part containing first metal having a melting point equal to or higher than 130°C and equal to or lower than 400°C and/or a first metal alloy having a melting point equal to or higher than 130°C and equal to or lower than 400°C is formed between the recessed part and an outer surface of the container part , and the base block includes the recessed part and a pair of wall parts projecting along an outer circumferential surface of the heat receiving tubular portion from width direction both sides of the recessed part , and the container part of the heat pipe is caulked and fixed to the recessed part and the pair of wall parts , characterised in that a second metal part containing second metal having a melting point higher than 400°C and equal to or lower than 1500°C and/or a second metal alloy having a melting point higher than 400°C and equal to or lower than 1500°C is further formed between the outer surface of the container part and the first metal part , and wherein the first metal part extends from between a half on a base block side in the container part and the recessed part to between the container part and the pair of wall parts . <EOS>