PURPOSE: To provide a tire vulcanizing machine, by which easy and quick mold change work is realized.

CONSTITUTION: In a first through passage 56 ranging from the top surface of a bolster 51 to the bottom surface of an upper platen 53, at the opening part 1 of the upper platen 53, a lid body 3 having a protruding part 6, which protrudes beyond the bottom surface of the upper platen 53 towards communicating holes 12 communicating a second through passage 57 ranging from the upper platen 53 side surface of a mold member 54 with the first through passage 56 and the second through passage 57, is provided. In addition, a blocking tube 4, whichblocks an upper platen 53 side opening part 2 from inside by being energized with a spring 11 or the like in the second through passage 57 and has the communicating holes 12 communicating the outward side space 9 of the second through passage 57 and its inward side space 14 with each other through the movement inwards the second through passage 57 under the condition being pressed by the protruding part 6 provided on the lid body 3, is provided.