To recover Rh(II) from HNO3 solution, adsorption experiments have been performed using an ion-exchange resin bearing an N,N,N-trimethylglycine group (AMP03). AMP03 was found to exhibit relatively high adsorption ability for Rh(III) for [BNO3](surp) < 0.02 M ([HNO3](surp) denotes HNO3 concentration in the supernatant), and the K-d values increase significantly with the addition of triethylamine or tris(2-aminoethyl)amine to 0.12 M HNO3 solutions. In contrast, the addition of thiourea leads to a decrease in the K-d values; i.e., a masking effect on Rh(III) was observed. These results show that AMP03 has a significant potential for effectively recovering Rh from HNO3 solution.