PURPOSE: To obtain advantages, in which a sill and a headjamb are cleaned easily and appearance is also improved while the slipping-off of a horizontally sliding door can also be prevented, only by forming one easily workable grooves to the sill and the headjamb respectively.

CONSTITUTION: In horizontally sliding door structure 1, in which a plurality of horizontally sliding doors 2L are incorporated movably along the grooves 61, 71 of a sill 7 and a headjamb 6, one wide grooves 61, 71, in which the upper and lower end sections of a plurality of horizontally sliding door bodies 3, 3 are collectively housed respectively, are formed to the sill 7 and the headjamb 6 respectively. On the other hand, a wide door pull member 5L, upper and lower end sections of which are engaged into the width of one grooves 61, 71 of the sill 7 and the headjamb 6 respectively, are bonded and mounted at least one side end sections of a plurality of the horizontally sliding door bodies 3.