During its first week on sale in Japan, the PlayStation VR sold 51,644 units. In comparison, the biggest selling hardware that week, the PlayStation 4, sold 30,154 units.
Via 4Gamer, here are the hardware sales for the week of October 10 to October 16. Note that the PSVR went on sale October 13.
PS VR: 51,644 units
New 3DS XL: 15,905
New 3DS: 2,983
Wii U: 2,430
Xbox One: 323
3DS XL: 71
Those long launch day lines did translate into big PSVR sales.