A fiber bundle joining apparatus includes: a support table configured to hold a terminal end portion side of a first fiber bundle; a roller mechanism having a roller around which a leading end portion side of a second fiber bundle is capable of being wound; a movement mechanism configured to perform a first movement for moving the roller mechanism to the vicinity of the terminal end portion side of the first fiber bundle, and a second movement for further moving the roller mechanism on the terminal end portion side of the first fiber bundle to create a state where the leading end portion side of the second fiber bundle is stacked on the terminal end portion side of the first fiber bundle; and a thermocompression bonding mechanism configured to pressure-bond the first fiber bundle and the second fiber bundle.