Provided is a plate-type column which allows the temperature of its inner passage to be rapidly increased or decreased while ensuring the correctness of an analysis or other operations. A plate-type column 10 includes: a plate-shaped main body 11; projecting portions 12 and 13 protruding from a circumferential edge of the main body 11; and a fluid-flow passage 14 extending in the main body 11 and the projecting portions 12 and 13. An intermediate portion of the passage 14 is provided in the main body 11, while each of the end portions of the passage 14 extends from the main body 11 through the projecting portion 12 or 13, with each of the end portions being open to the outside at the tip of the projecting portion 12 or 13.