diff --git a/sklearn/linear_model/_ransac.py b/sklearn/linear_model/_ransac.py
index 40ebb3a08420f..a5511b49e1ba1 100644
--- a/sklearn/linear_model/_ransac.py
+++ b/sklearn/linear_model/_ransac.py
@@ -373,7 +373,8 @@ def fit(self, X, y, sample_weight=None):
 
             # residuals of all data for current random sample model
             y_pred = base_estimator.predict(X)
-            residuals_subset = loss_function(y, y_pred)
+            sample_weight = _check_sample_weight(sample_weight, X)
+            residuals_subset = loss_function(y, y_pred) * sample_weight
 
             # classify data into inliers and outliers
             inlier_mask_subset = residuals_subset < residual_threshold