We report on the first case of multiresistant Pseudomonas aeruginosa harbouring the metallo-β-lactamase IMP-15 isolated in Switzerland from a patient repatriated from Cambodia. The laboratory diagnosis of IMP-15 was hampered by two negative tests for carbapenemase detection. The carbapenemase gene was subsequently detected by whole genome sequencing and the isolate further characterised by various phenotypic and genotypic analyses.