The yen continued to build momentum yesterday after the race for Japan's new prime minister was formally declared.
Former chief cabinet secretary Seiroku Kajiyama and foreign minister Keizo Obuchi threw their hats into the ring in what analysts said was a contest which would result - whoever won - in much-needed economic and financial reforms.
An unexpected candidacy was also announced late in the day by Health Minister Junichiro Koizumi.
The yen jumped through the 139-yen barrier, peaking at 138.68 at one point yesterday, compared with the New York close of 139.9 on Thursday.
The movement in the yen ended a week which had seen dramatic political turmoil after a poor showing by the ruling Liberal Democratic Party in the Upper House elections on Sunday, prompting Prime Minister Ryutaro Hashimoto to resign.
The currency initially sank on the news but in a volatile week of trading ended up 1 per cent, cheering currencies throughout the region.