A sensor guide wire for an intravascular measurement of at least one variable in a living body, wherein the sensor guide wire has a proximal region, a distal sensor region and a tip region, the sensor guide wire comprising: a sensor element arranged in the sensor region, the sensor element comprising a sensor portion configured to measure the variable and to generate a sensor signal in response to the variable; a jacket enclosing at least part of the sensor element, wherein the jacket includes at least a sensor opening, and wherein a distal end of the jacket is located distal of the sensor element; and a core wire, having a longitudinal axis and comprising at least a tip core wire portion extending along said tip region of the sensor guide wire; wherein the tip core wire portion comprises: a proximal portion, an intermediate portion located distal of the proximal portion, a diameter (D 2) of the intermediate portion being less than a diameter of the proximal portion, and a distal tip including an enlargement, a diameter (D 1) of the enlargement being greater than the diameter (D 2) of the intermediate portion; a polymer layer is disposed directly on the intermediate portion of the tip core wire portion; the proximal portion of the tip core wire portion, the intermediate portion of the tip core wire portion, and the distal tip of the tip core wire portion are formed integrally as a single piece; a proximal end of the polymer layer extends distally from the distal end of the jacket; and a distal end of the polymer layer extends proximally from a proximal end of the enlargement of the distal tip. a sensor element arranged in the sensor region, the sensor element comprising a sensor portion configured to measure the variable and to generate a sensor signal in response to the variable; a jacket enclosing at least part of the sensor element, wherein the jacket includes at least a sensor opening, and wherein a distal end of the jacket is located distal of the sensor element; and a core wire, having a longitudinal axis and comprising at least a tip core wire portion extending along said tip region of the sensor guide wire; wherein the tip core wire portion comprises: a proximal portion, an intermediate portion located distal of the proximal portion, a diameter (D 2) of the intermediate portion being less than a diameter of the proximal portion, and a distal tip including an enlargement, a diameter (D 1) of the enlargement being greater than the diameter (D 2) of the intermediate portion; a proximal portion, an intermediate portion located distal of the proximal portion, a diameter (D 2) of the intermediate portion being less than a diameter of the proximal portion, and a distal tip including an enlargement, a diameter (D 1) of the enlargement being greater than the diameter (D 2) of the intermediate portion; a polymer layer is disposed directly on the intermediate portion of the tip core wire portion; the proximal portion of the tip core wire portion, the intermediate portion of the tip core wire portion, and the distal tip of the tip core wire portion are formed integrally as a single piece; a proximal end of the polymer layer extends distally from the distal end of the jacket; and a distal end of the polymer layer extends proximally from a proximal end of the enlargement of the distal tip.