[Object] A safe hydrogen storage tank in a highly reliable form where it is difficult for fatigue failure to occur is provided as a hydrogen storage tank where a cartridge is filled with a hydrogen occluding substance and contained within an integrally molded liner made of a metal.[Means for Achieving Object] A cartridge 10 is formed of a cartridge main body portion 11, a fixed side axial portion 13 and a free side axial portion 12, and an integrally molded liner 20 which is seamless is formed of a liner torso portion 21, a fixed side end portion 25 where a fixed side opening 25a is created via a portion in dome form 24 and a free side end portion 23 where a free side opening 23a for supporting a support plug 30 is created via a portion in dome form 22 in order to support a free side axial portion 12a, in such a manner that the fixed side opening 25a fixes and supports the fixed side axial portion 13 and is sealed by a sealing plug 40 while the free side opening 23a is sealed by the support plug 30, and the free side axial portion 12 is inserted into and supported by the recess 31 created in the support plug 30 so as to be moveable forward and backward in the direction of the axial line.