To provide an end seal structure of a partition wall installed in a room such as a residence and an office to partition the inside of the room into multiple rooms, capable of well sealing the side edge of the partition wall and the wall surface in contact with the side edge even if the interval between the side edge and the wall surface is slightly varied, and having excellent aesthetic appearance.

In this end seal structure of a partition wall P, the side edge of the partition wall P is brought into contact with the other wall surface W through seal members 3. The pair of seal members 3 of generally quarter-arcuate seal member 3 in cross section is fitted to the side edge of the partition wall P in the direction parallel to the thickness direction of the partition wall P with their free ends facing each other in the mutually proximity directions.