Reservoir tank

A reservoir tank which includes a reservoir body formed in a hollow box shape for storing a hydraulic fluid inside the reservoir tank, and is connected to a vehicle master cylinder in such a way that the hydraulic fluid flows into and out, wherein:

• the reservoir body includes a top plate portion formed in a plate shape,
• on an inner wall surface of the top plate portion, a flow path portion which has one or more flow paths formed in a serpentine fashion so as to be opened toward a lower side in a vertical direction is provided in a protruding manner,
• on a downstream side of the flow path, an opening is formed,
• the flow path portion is composed of a plurality of first ribs and a plurality of second ribs provided in a protruding manner from the inner wall surface of the top plate portion and arranged so as to face each other,
• at least one of the plurality of first ribs is disposed such that a leading end of the first rib facing the second ribs enters between leading ends of two neighboring second ribs facing the first ribs, and
• at least one of the plurality of second ribs is disposed such that a leading end of the second rib enters between leading ends of two neighboring first ribs.