DIsclosed herein is a guide wire having a long wire proper (2) and also having a radiopaque part (7) capable of forming an X-ray image formed at the distal end therof,said radiopaque part (7) having the first radiopaque region (71), the second radiopaque region (72), and the thrid radiopaque region (73) which are arranged sequentially from the distal end in the lenghtwise direction thereof,said second radiopaque region (72) being less capable of forming an X-ray image than either of said first radiopaque region (71) and said third radiopaque region (73), andsaid first radiopaque region (71) having a length L1, said second radiopaque region (72) having a length L2, and said third radiopaque region (73) having a length L3, such that L1 > L2 ≥ L3.
