Subclavian vessels are well protected by muscles, fascia and sheaths, so vascular complications associated with clavicular fractures are rare. Pseudoaneurysms after clavicular fractures have been reported, and the occurrence or rupture of pseudoaneurysm has been reported rarely as a late complication. However, cases of pseudoaneurysm after rupture of the clavicular fracture following delayed osteosynthesis of the clavicular fracture have not been reported. A 58-year-old female that presented with a right clavicular shaft fracture obtained conservative treatment. Surgery was performed after 4 months because of non-union in the local medical center. After operation, rupture of the subclavian pseudoaneurysm occurred following osteosynthesis of the clavicular shaft fracture. We report this case here with a review of the literature.