To provide epock-making crack inducing joint structure capable of obtaining a sufficient water stop effect without applying special work as well as capable of sufficiently securing durability of a structure.

A concrete for forming a concrete structure 12 in the neighbourhood of a crack inducing joint 13 is made to be a concrete containing a crystal breeding material having a function to breed a compound of C-S-H system crystal, MgSiO3, crystal, etc., in a chain, so that a crack induced in the neighbourhood of the joint 13 is automatically blocked. Additionally, it is devised to supply the crystal breeding material to a surface of the joint 13 from mortar 15 by filling the mortar 15 containing the crystal breeding material in the joint 13. Additionally, it is devised to automatically block a crack induced on the joint 13 by applying the crystal breeding material on the surface of the joint 13.