To provide a sealing tool for improving work efficiency.

The sealing tool 1 includes: a sealing tool body 2; a groove part 3 which is formed on the surface of the sealing tool body 2 and in which a sealing line 4 can be arranged and, further, a through-hole which is formed on the side face of the sealing tool body 2 and through which the sealing line 4 can be inserted. The through-hole is formed in the direction parallel to the groove part 3. A sealing tool compression tool includes: a first holding part; a second holding part; a connection part; a first pressing part provided more on the other end side than the connection part of the first holding part and pressing one face of the sealing tool 1 by bringing one end side of the first holding part and one end side of the second holding part close to each other; a second pressing part provided more on the other end side than the connection part of the second holding part and pressing the other face of the sealing tool 1 by bringing one end side of the second holding part and one end side of the first holding part close to each other; a sealing tool holding part provided between the first pressing part and the second pressing part and holding the side face of the sealing tool 1; and a sealing line arranging groove part which is provided to the sealing tool holding part and in which the sealing line 4 can be arranged.