| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of achieving precise thread engagement at a predetermined relative position.SOLUTION: A thread engagement structure X applied to a container body 1 and a cap 7 comprises: a first thread fitting part X1 including a first thread groove 81 provided to the container body 1 being a thread engaged body and a first protrusion 71 provided to the cap 7 being a thread engagement body thread fitted to the container body insertable to the first thread groove so that the container body 1 and the cap 7 are thread engaged in a final state (Q) forming a predetermined angle by relatively rotating them from a start position (P) forming a predetermined one relative angle; and a second thread fitting part X2 including a second thread groove 82 formed of a recess with a dimension deeper than that of the first thread groove 81 and a second protrusion 72 capable of inserted and thread engaged with only the predetermined second thread groove 82 and incapable of being inserted into the first thread groove 81. |
