A left-wing Green-Labour alliance is also on course to win 15 Senate seats, while Prime Minister Mark Rutte's four-party coalition is poised to fall back to 24 - down eight seats.
Turnout in Wednesday's vote, estimated at 57.5%, was the highest for years and the biggest loser of the night was the far-right Forum for Democracy party.
For rural voters, the main incentive for backing the BBB was to protest against cuts in nitrogen emissions, according to an Ipsos poll for public broadcaster NOS.
But voters also turned out in force for the Greens, and environmental groups warned that the Netherlands' problems were not going away.ufabet เว็บหลัก