LOCK STRUCTURE, ELECTRIC CONNECTION BOX AND WIRE HARNESS

A lock structure includes an engaged body; and an engaging body capable of inserting and removing the engaged body along insertion and removal directions opposite to each other. An engaged body has a drainage space surrounded by inner wall surfaces of first and second engaged walls and third and fourth engaged walls disposed opposite to each other at an interval, an engaged protrusion protruding from an outer wall surface of the second engaged wall. An engaging body has an accommodation space that is an internal space surrounded by inner wall surfaces of first and second engaging walls and third and fourth engaging walls disposed opposite to each other at an interval and in which the engaged body is accommodated.