VEHICULAR BRAKING DEVICE

To provide a vehicular braking device capable of detecting abnormality, such as air contamination, in a constitution having two systems that are not directly connected to each other.SOLUTION: A vehicular braking device includes: a cylinder unit 2 having a piston 22 which can slide inside a cylinder 21 according to a difference between input pressure and output pressure, and constituted to be capable of forming a differential pressure generation state that is a state in which the output pressure is greater than the input pressure; a first liquid passage 601 connecting an input chamber 211 with first wheel cylinders 53 and 54; a second liquid passage 602 connecting an output chamber 212 with second wheel cylinders 51 and 52; and a detector 92 detecting abnormality of the first liquid passage 601, on the basis of an amount of change in liquid pressure inside the first liquid passage 601 at the time the piston 22 slides from a differential pressure position being a position of the piston 22 in the differential pressure generation state, to a balanced position being a position of the piston 22 in a state that the input pressure and the output pressure are balanced.SELECTED DRAWING: Figure 1 【課題】直接的に接続されていない２つの系統をもつ構成において、エア混入等の異常を検出することができる車両用制動装置を提供する。【解決手段】入力圧と出力圧との差に応じてシリンダ２１内を摺動可能なピストン２２を有し、出力圧が入力圧よりも大きい状態である差圧発生状態を形成可能に構成されたシリンダユニット２と、入力室２１１と第１ホイールシリンダ５３、５４とを接続する第１液路６０１と、出力室２１２と第２ホイールシリンダ５１、５２とを接続する第２液路６０２と、差圧発生状態におけるピストン２２の位置である差圧位置から、入力圧と出力圧とがつりあった状態におけるピストン２２の位置であるつりあい位置までピストン２２が摺動する際の第１液路６０１内の液圧変化量に基づいて、第１液路６０１の異常を検出する検出部９２と、を備える。【選択図】図１