The invention discloses a railway passenger car carriage and a railway passenger car. The railway passenger car carriage comprises at least two seat units, wherein the seat units are arranged in the length direction of the carriage, and each of the seat units can be rotated to face the traveling direction of a vehicle relative to floors of the carriage; each of the seat units comprises a seat and a table, the seat and the table are arranged side by side in the width direction of the carriage, and the width of the table is smaller than that of the seat; the front-row seat and the back-row table of the two adjacent seat units are positioned in the same line, the front-row table and the back-row seat of the two adjacent seat units are positioned in the same line, a cavity for accommodating legs of passengers is formed in the lower part of each of the tables, and the opening of the cavity is formed in the lateral wall of the table and faces the back-row seat. The railway passenger car carriage and the railway passenger car, which are provided by the invention, can satisfy requirements for comfort degree of the passengers, improve convenience of riding, and besides fully utilize the space of the carriage, so that the fixed number of the passengers can be increased.