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L1521F is found to be forming multiple cores and it is cited as an example ofthe densest core with an embedded VeLLO in a highly dynamical environment. Wepresent the core-scale magnetic fields (B-fields) in the near vicinity of theVeLLO L1521F-IRS using submm polarization measurements at 850$~\mu$m using JCMTPOL-2. This is the first attempt to use high-sensitivity observations to mapthe sub-parsec scale B-fields in a core with a VeLLO. The B-fields are orderedand very well connected to the parsec-scale field geometry seen in our earlieroptical polarization observations and the large-scale structure seen in Planckdust polarization. The core scale B-field strength estimated usingDavis-Chandrasekhar-Fermi relation is $\rm 330\pm100~\mu$G which is more thanten times of the value we obtained in the envelope (envelope in this paper is"core envelope"). This indicates that B-fields are getting stronger on smallerscales. The magnetic energies are found to be 1 to 2 orders of magnitude higherthan non-thermal kinetic energies in the envelope and core. This suggests thatmagnetic fields are more important than turbulence in the energy budget ofL1521F. The mass-to-flux ratio of 2.3$\pm$0.7 suggests that the core ismagnetically-supercritical. The degree of polarization is steadily decreasingtowards the denser part of the core with a power law slope of -0.86.

First Sub-pc Sale Mapping of Magnetic Fields in the Vicinity of a Very Low Luminosity Object, L1521F-IRS