diff --git a/d3rlpy/datasets.py b/d3rlpy/datasets.py
index 96ee07da..f180d7bd 100644
--- a/d3rlpy/datasets.py
+++ b/d3rlpy/datasets.py
@@ -470,28 +470,43 @@ def get_minari(
     try:
         import minari
 
-        _dataset: minari.MinariDataset = minari.load_dataset(
-            env_name, download=True
-        )
+        _dataset = minari.load_dataset(env_name, download=True)
 
-        data: Dict[str, List[NDArray]] = {
-            "observations": [],
-            "actions": [],
-            "rewards": [],
-            "terminations": [],
-            "truncations": [],
-        }
+        observations = []
+        actions = []
+        rewards = []
+        terminals = []
+        timeouts = []
 
         for ep in _dataset:
-            for k, v in data.items():
-                v.append(getattr(ep, k))
+            if isinstance(ep.observations, dict):
+                if (
+                    "desired_goal" in ep.observations
+                    and "observation" in ep.observations
+                ):
+                    _observations = np.concatenate(
+                        [
+                            ep.observations["observation"],
+                            ep.observations["desired_goal"],
+                        ],
+                        axis=-1,
+                    )
+                else:
+                    raise ValueError("Unsupported observation format.")
+            else:
+                _observations = ep.observations
+            observations.append(_observations)
+            actions.append(ep.actions)
+            rewards.append(ep.rewards)
+            terminals.append(ep.terminations)
+            timeouts.append(ep.truncations)
 
         dataset = MDPDataset(
-            observations=np.concatenate(data["observations"]),
-            actions=np.concatenate(data["actions"]),
-            rewards=np.concatenate(data["rewards"]),
-            terminals=np.concatenate(data["terminations"]),
-            timeouts=np.concatenate(data["truncations"]),
+            observations=np.concatenate(observations),
+            actions=np.concatenate(actions),
+            rewards=np.concatenate(rewards),
+            terminals=np.concatenate(terminals),
+            timeouts=np.concatenate(timeouts),
             transition_picker=transition_picker,
             trajectory_slicer=trajectory_slicer,
         )