Medical guide wire

A medical guide wire, comprising:

• a core that has a portion gradually tapered in diameter from a proximal end side to a distal end side;
• and
• an outer coil into which a distal end portion of the core is inserted, wherein
• the distal end side of the outer coil is connected with the distal end side of the distal end portion of the core to form a distal joining section,
• the proximal end side of the outer coil is connected with the proximal end side of the distal end portion of the core to form an outer coil proximal joining section,
• the distal end portion of the core is a combined truncated cone formed by longitudinally connecting at least two truncated cones,
• a longitudinal length of each of the truncated cones is reduced in order from the proximal end side to the distal end side,
• an outer diameter ratio between a first maximum outer diameter of the proximal end side and a first minimum outer diameter of the distal end side in each of the truncated cones is increased in order from the proximal end side to the distal end side, the outer diameter ratio being calculated by dividing the first maximum outer diameter of the proximal end side by the first minimum outer diameter of the distal end side, and
• when a second maximum outer diameter of the combined truncated cone is defined as D0, a second minimum outer diameter of the combined truncated cone is defined as D1, a total length of the combined truncated cone is defined as L, and an outer diameter at an arbitrary position X, which is located from a center in a cross section of the second maximum outer diameter D0 to the distal end side of the combined truncated cone, is defined as Dm, and the arbitrary position X is within a range of 0<X<L, the outer diameter Dm of the combined truncated cone satisfies the following relational expression:
• Dm>{D0−(D0−D1)X/L}.