ARMREST TILTING DEVICE

The present disclosure relates to an armrest tilting device provided on a seat and capable of tilting and adjusting an armrest capable of supporting a user's arm. The armrest tilting device includes: a shaft which is installed on a seat and has one end installed on an armrest in such a way as to be relatively rotated; a housing which is fastened to the armrest and supports the shaft in the state where the shaft is installed on the armrest; a bracket which is fastened and fixed to the shaft; a ratchet which is rotatably fastened to a hinge member fastened to the bracket; a sector gear portion which is fastened to and rotates together with the armrest and is engaged with the ratchet; a guide plate which is provided on the sector gear portion and where the ratchet moves in one area while being separated from the sector gear portion; and an elastic member which applies an elastic force such that ratchet gear teeth formed on the ratchet are meshed with sector gear teeth formed on the sector gear portion.