A specimen processing system comprising: a culture vessel open on a top surface of the culture vessel and comprising a culture surface which comprises a circular shape and on which cells are culturable; a spatula comprising a blade to remove the cells off the culture surface; a robot comprising a hand to hold at least one of the culture vessel and the spatula; and a robot controller configured to control the robot and comprising an operation controller configured to control the robot to perform: a first operation to move the spatula relative to the culture vessel with a first end of the blade on a circumference of the culture surface so as to remove first cells among the cells on the culture surface that are nearer the circumference of the culture surface; and a second operation to move the spatula relative to the culture vessel so as to remove second cells among the cells on the culture surface that are inner than the first cells on the culture surface characterized in that in the first operation, the operation controller is configured to control the robot to keep the blade inclined relative to a radial direction of the culture vessel with a second end of the blade being displaced from the radial direction relative to the first end of the blade in a backward direction opposite to a forward direction in which the spatula moves. a culture vessel open on a top surface of the culture vessel and comprising a culture surface which comprises a circular shape and on which cells are culturable; a spatula comprising a blade to remove the cells off the culture surface; a robot comprising a hand to hold at least one of the culture vessel and the spatula; and a robot controller configured to control the robot and comprising an operation controller configured to control the robot to perform: a first operation to move the spatula relative to the culture vessel with a first end of the blade on a circumference of the culture surface so as to remove first cells among the cells on the culture surface that are nearer the circumference of the culture surface; and a second operation to move the spatula relative to the culture vessel so as to remove second cells among the cells on the culture surface that are inner than the first cells on the culture surface characterized in that in the first operation, the operation controller is configured to control the robot to keep the blade inclined relative to a radial direction of the culture vessel with a second end of the blade being displaced from the radial direction relative to the first end of the blade in a backward direction opposite to a forward direction in which the spatula moves. a first operation to move the spatula relative to the culture vessel with a first end of the blade on a circumference of the culture surface so as to remove first cells among the cells on the culture surface that are nearer the circumference of the culture surface; and a second operation to move the spatula relative to the culture vessel so as to remove second cells among the cells on the culture surface that are inner than the first cells on the culture surface characterized in that in the first operation, the operation controller is configured to control the robot to keep the blade inclined relative to a radial direction of the culture vessel with a second end of the blade being displaced from the radial direction relative to the first end of the blade in a backward direction opposite to a forward direction in which the spatula moves.