[Problem] Provided is a pharmaceutical composition for treating multiple myeloma.[Means for Solution] The inventors of the present invention conducted examinations on a compound having an effect of inhibiting mitochondrial Complex I, and confirmed that a bicyclic nitrogen-containing aromatic heterocyclic amide compound of the present invention has the effect of inhibiting mitochondrial Complex I and that this compound exhibits the effect of inhibiting growth of multiple myeloma, and therefore completed the present invention.
