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.