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
PS4: 30,154
New 3DS XL: 15,905
Vita: 8,772
2DS: 8,203
New 3DS: 2,983
Wii U: 2,430
PS3: 814
3DS: 346
Xbox One: 323
3DS XL: 71
Those long launch day lines did translate into big PSVR sales.