东京工业品交易所橡胶期货主力合约收报168.9日圆/千克，较上一交易日下跌0.7日圆/千克。 
以下是TOCOM 9月21日橡胶期货行情:                                                   
合约      昨收    开盘    最高    最低    收盘    涨跌    成交量                   
18/09月   145.2   145     145     145     145     -0.2    5                        
18/10月   149.8   149.9   149.9   148.6   149.5   -0.3    43                       
18/11月   155     155     155     153.4   154     -1      126                      
18/12月   159.5   159.2   159.6   158.1   159     -0.5    137                      
19/01月   166.3   166.5   166.5   164.7   165.5   -0.8    282                      
19/02月   169.6   169.6   169.6   167.8   168.9   -0.7    1,853                    
合计                                                      2,446                    
注:1.单位:日圆/千克；成交量单位:手。                                               
2.最小价格变动单位日圆/千克。