Abstract: A screen printing apparatus for printing on a board, such as a circuit board, through a screen using a paste prior to surface-mounting electronic components on the board, and more particularly a screen printing apparatus that performs a screen printing while automatically discharging the paste that is accommodated inside the main body.

Abstract: A screen printing apparatus has a housing-like main body that is long sideways. Inside the main body, there are provided a paste-receiving chamber (1); a roller (2) provided along the axis of the main body; a scraper (3) that extends forward and diagonally downward, and, in printing, whose tip slides on the upper face of a screen plate (S) while being in contact with the face; and a guide plate (5) that extends backward and diagonally downward so as to be opposed to the scraper, and, in printing, whose tip ends at a height where a predetermined gap (4) is maintained from the tip to the screen plate upper face. Paste (H) can be filled in opening holes (S?) of the screen plate by fluid pressure of the paste discharged from a discharge opening (6) opened between the scraper and the guide plate. The filling is achieved by moving the main body forward, or in a printing direction, and rotating the roller in one direction.