An aerosol-type liquid sprayer is adapted to spray liquid steadily without loosening. An erecting wall having an upper end portion engaged with an upper portion of a cylinder is connected to the outer surface of a container body neck portion. An erecting guide trunk is connected to the lower end of the erecting wall, and surrounds the erecting wall at a constant distance. A sliding trunk moves a piston upwardly and downwardly and is fitted into a gap between the erecting wall and the guide trunk. The sliding trunk is guided by the guide trunk, allowing the sliding trunk to be stably moved upwardly and downwardly.