The　objective　of　this　research　was　to　reveal　the　thermal　characteristics　of　microwave　ablations　in　the　vicinity　of　an　arterial　bifurcation.　The　temperature　distribution　after　microwave　heating　of　a　liver-like　material　with　the　close　presence　of　an　arterial　bifurcation　was　simulated　using　the　finite　element　method.　Coupled　fluid　flow　and　solid　heat　transfer　were　taken　into　consideration,　and　a　three-dimensional　analysis　was　performed.　The　experimentally　determined　SAR　(specific　absorption　rate)　generated　by　the　absorption　of　microwaves　in　liver-like　material　was　used　in　the　analysis　instead　of　utilizing　electromagnetic　calculations.　Several　different　tests　of　time-controlled　ablations　with　varying　distances　between　the　microwave　antenna　and　the　bifurcation　were　performed,　and　the　detailed　temperature　distributions　near　the　bifurcation　were　obtained.　The　interaction　between　the　recirculation　flow　in　the　bifurcation　and　the　heat　transfer　in　the　surrounding　tissue　makes　the　temperature　distribution　near　the　bifurcation　complicated.　Most　importantly,　after　a　period　of　continuous　heating　with　constant　microwave　output　power,　the　maximum　temperatures　caused　by　the　ablation　did　not　always　increase　with　the　distance　between　the　antenna　and　the　bifurcation.　It　can　be　concluded　that　inadequate　ablations　can　be　the　result　not　only　of　a　close　distance　between　the　antenna　and　the　blood　vessel,　but　also　of　complicated　blood　flow,　in　large　vessels　whose　structure　causes　recirculation　flow.