A first moving member is arranged on a base for reciprocal movement in an article transporting direction. A second moving member is arranged on the first moving member for reciprocal movement in the article transporting direction. The second moving member is adapted to contact each receptacle which is being transported to an operation position to which receptacles carrying articles to be treated are sequentially transported. A first biasing mechanism biases the first moving member in a direction opposite to the receptacle transporting direction. A second biasing mechanism biases the second moving member in a direction opposite to the receptacle transporting direction by a biasing force smaller than a biasing force of the first biasing mechanism. Pressing arm is mounted on the first moving member for movement toward and away from the articles to be treated on each receptacle at the operation position. A link mechanism links between the pressing arm and the second moving member for moving the pressing arm to press articles on the receptacle when the first and second moving members are relatively moved.