  For a finite dimensional algebra $A$, the notion of $g$-fan $\Sigma(A)$ is
defined from two-term silting complexes of $A$ in the real Grothendieck group
$K_0(\mathsf{proj} A)_{\mathbb{R}}$. In this paper, we discuss the theory of
shards to $\Sigma(A)$, which was originally defined for a hyperplane
arrangement. We establish a correspondence between the set of join-irreducible
elements of the poset of torsion classes of $\mathrm{mod} A$ and the set of
shards of $\Sigma(A)$ for $g$-finite algebra $A$. Moreover, we show that the
semistable region of a brick of $\mathrm{mod} A$ is exactly given by a shard.
We also give a poset isomorphism of shard intersections and wide subcategories
of $\mathrm{mod} A$.
